diff --git a/roles/custom/matrix-alertmanager-receiver/tasks/install.yml b/roles/custom/matrix-alertmanager-receiver/tasks/install.yml
index 97572b53f..ff707c8dc 100644
--- a/roles/custom/matrix-alertmanager-receiver/tasks/install.yml
+++ b/roles/custom/matrix-alertmanager-receiver/tasks/install.yml
@@ -53,6 +53,15 @@
 
 - when: matrix_alertmanager_receiver_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure matrix-alertmanager-receiver repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_alertmanager_receiver_container_src_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure matrix-alertmanager-receiver repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_alertmanager_receiver_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-appservice-draupnir-for-all/tasks/setup_install.yml b/roles/custom/matrix-appservice-draupnir-for-all/tasks/setup_install.yml
index b1b1d1dbf..68f12b161 100644
--- a/roles/custom/matrix-appservice-draupnir-for-all/tasks/setup_install.yml
+++ b/roles/custom/matrix-appservice-draupnir-for-all/tasks/setup_install.yml
@@ -35,6 +35,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_appservice_draupnir_for_all_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Draupnir repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_appservice_draupnir_for_all_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_appservice_draupnir_for_all_container_image_self_build | bool"
+
 - name: Ensure Draupnir repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_appservice_draupnir_for_all_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-authentication-service/tasks/install.yml b/roles/custom/matrix-authentication-service/tasks/install.yml
index f13415f6a..d1927a45f 100644
--- a/roles/custom/matrix-authentication-service/tasks/install.yml
+++ b/roles/custom/matrix-authentication-service/tasks/install.yml
@@ -95,6 +95,15 @@
 
 - when: "matrix_authentication_service_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure Matrix Authentication Service repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_authentication_service_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure Matrix Authentication Service repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_authentication_service_container_repo }}"
diff --git a/roles/custom/matrix-bot-baibot/tasks/install.yml b/roles/custom/matrix-bot-baibot/tasks/install.yml
index e31057943..db77eac90 100644
--- a/roles/custom/matrix-bot-baibot/tasks/install.yml
+++ b/roles/custom/matrix-bot-baibot/tasks/install.yml
@@ -49,6 +49,15 @@
 
 - when: "matrix_bot_baibot_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure baibot repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bot_baibot_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure baibot repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bot_baibot_container_repo }}"
diff --git a/roles/custom/matrix-bot-buscarron/tasks/setup_install.yml b/roles/custom/matrix-bot-buscarron/tasks/setup_install.yml
index e71713bfe..d37f77823 100644
--- a/roles/custom/matrix-bot-buscarron/tasks/setup_install.yml
+++ b/roles/custom/matrix-bot-buscarron/tasks/setup_install.yml
@@ -70,6 +70,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bot_buscarron_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Buscarron repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bot_buscarron_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bot_buscarron_container_image_self_build | bool"
+
 - name: Ensure Buscarron repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bot_buscarron_container_repo }}"
diff --git a/roles/custom/matrix-bot-draupnir/tasks/setup_install.yml b/roles/custom/matrix-bot-draupnir/tasks/setup_install.yml
index efe7bba24..6629c9868 100644
--- a/roles/custom/matrix-bot-draupnir/tasks/setup_install.yml
+++ b/roles/custom/matrix-bot-draupnir/tasks/setup_install.yml
@@ -47,6 +47,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bot_draupnir_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Draupnir repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bot_draupnir_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bot_draupnir_container_image_self_build | bool"
+
 - name: Ensure Draupnir repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bot_draupnir_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bot-honoroit/tasks/setup_install.yml b/roles/custom/matrix-bot-honoroit/tasks/setup_install.yml
index bd861d9b3..846bcbf19 100644
--- a/roles/custom/matrix-bot-honoroit/tasks/setup_install.yml
+++ b/roles/custom/matrix-bot-honoroit/tasks/setup_install.yml
@@ -72,6 +72,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bot_honoroit_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Honoroit repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bot_honoroit_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bot_honoroit_container_image_self_build | bool"
+
 - name: Ensure Honoroit repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bot_honoroit_container_repo }}"
diff --git a/roles/custom/matrix-bot-matrix-reminder-bot/tasks/setup_install.yml b/roles/custom/matrix-bot-matrix-reminder-bot/tasks/setup_install.yml
index 1c2c0af65..448d4bb8e 100644
--- a/roles/custom/matrix-bot-matrix-reminder-bot/tasks/setup_install.yml
+++ b/roles/custom/matrix-bot-matrix-reminder-bot/tasks/setup_install.yml
@@ -62,6 +62,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bot_matrix_reminder_bot_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure matrix-reminder-bot repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bot_matrix_reminder_bot_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bot_matrix_reminder_bot_container_image_self_build | bool"
+
 - name: Ensure matrix-reminder-bot repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bot_matrix_reminder_bot_container_repo }}"
diff --git a/roles/custom/matrix-bot-maubot/tasks/setup_install.yml b/roles/custom/matrix-bot-maubot/tasks/setup_install.yml
index 3ae13bc59..3486bcc56 100644
--- a/roles/custom/matrix-bot-maubot/tasks/setup_install.yml
+++ b/roles/custom/matrix-bot-maubot/tasks/setup_install.yml
@@ -48,6 +48,15 @@
 
 - when: matrix_bot_maubot_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure maubot repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bot_maubot_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure maubot repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bot_maubot_container_repo }}"
diff --git a/roles/custom/matrix-bot-mjolnir/tasks/setup_install.yml b/roles/custom/matrix-bot-mjolnir/tasks/setup_install.yml
index 92e8bd4d7..bae12a370 100644
--- a/roles/custom/matrix-bot-mjolnir/tasks/setup_install.yml
+++ b/roles/custom/matrix-bot-mjolnir/tasks/setup_install.yml
@@ -37,6 +37,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bot_mjolnir_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure mjolnir repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bot_mjolnir_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bot_mjolnir_container_image_self_build | bool"
+
 - name: Ensure mjolnir repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bot_mjolnir_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-appservice-irc/tasks/setup_install.yml b/roles/custom/matrix-bridge-appservice-irc/tasks/setup_install.yml
index 31ed0a300..f267ff5b5 100644
--- a/roles/custom/matrix-bridge-appservice-irc/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-appservice-irc/tasks/setup_install.yml
@@ -89,6 +89,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_appservice_irc_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure matrix-appservice-irc repository ownership is correct when self-building
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_appservice_irc_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_appservice_irc_enabled | bool and matrix_bridge_appservice_irc_container_image_self_build | bool"
+
 - name: Ensure matrix-appservice-irc repository is present when self-building
   ansible.builtin.git:
     repo: "{{ matrix_bridge_appservice_irc_container_repo }}"
diff --git a/roles/custom/matrix-bridge-beeper-line/tasks/setup_install.yml b/roles/custom/matrix-bridge-beeper-line/tasks/setup_install.yml
index 8ac4823cb..58a66299d 100644
--- a/roles/custom/matrix-bridge-beeper-line/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-beeper-line/tasks/setup_install.yml
@@ -57,6 +57,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_beeper_line_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Beeper LINE repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_beeper_line_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_beeper_line_container_image_self_build | bool"
+
 - name: Ensure Beeper LINE repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_beeper_line_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-beeper-linkedin/tasks/setup_install.yml b/roles/custom/matrix-bridge-beeper-linkedin/tasks/setup_install.yml
index 9e668a676..163d83559 100644
--- a/roles/custom/matrix-bridge-beeper-linkedin/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-beeper-linkedin/tasks/setup_install.yml
@@ -55,6 +55,15 @@
 
 - when: "matrix_bridge_beeper_linkedin_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure Beeper LinkedIn repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bridge_beeper_linkedin_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure Beeper LinkedIn repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bridge_beeper_linkedin_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-hookshot/tasks/setup_install.yml b/roles/custom/matrix-bridge-hookshot/tasks/setup_install.yml
index 57bc365de..698042b81 100644
--- a/roles/custom/matrix-bridge-hookshot/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-hookshot/tasks/setup_install.yml
@@ -38,6 +38,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_hookshot_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure hookshot repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_hookshot_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_hookshot_container_image_self_build | bool"
+
 - name: Ensure hookshot repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_hookshot_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-bluesky/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-bluesky/tasks/setup_install.yml
index 263dd2219..98e6f499e 100644
--- a/roles/custom/matrix-bridge-mautrix-bluesky/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-bluesky/tasks/setup_install.yml
@@ -31,6 +31,16 @@
     - {path: "{{ matrix_bridge_mautrix_bluesky_container_src_files_path }}", when: "{{ matrix_bridge_mautrix_bluesky_container_image_self_build }}"}
   when: item.when | bool
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix Bluesky repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_bluesky_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_bluesky_enabled | bool and matrix_bridge_mautrix_bluesky_container_image_self_build"
+
 - name: Ensure Mautrix Bluesky repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_bluesky_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-discord/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-discord/tasks/setup_install.yml
index 0077aece8..92aecc6a0 100644
--- a/roles/custom/matrix-bridge-mautrix-discord/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-discord/tasks/setup_install.yml
@@ -59,6 +59,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_discord_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix discord repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_discord_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_discord_container_image_self_build | bool"
+
 - name: Ensure Mautrix discord repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_discord_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-gmessages/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-gmessages/tasks/setup_install.yml
index 0a14e4687..5465a1a4f 100644
--- a/roles/custom/matrix-bridge-mautrix-gmessages/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-gmessages/tasks/setup_install.yml
@@ -59,6 +59,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_gmessages_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix gmessages repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_gmessages_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_gmessages_container_image_self_build | bool"
+
 - name: Ensure Mautrix gmessages repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_gmessages_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-googlechat/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-googlechat/tasks/setup_install.yml
index 6e2bfefb1..a9249a38c 100644
--- a/roles/custom/matrix-bridge-mautrix-googlechat/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-googlechat/tasks/setup_install.yml
@@ -61,6 +61,16 @@
     - {path: "{{ matrix_bridge_mautrix_googlechat_container_src_files_path }}", when: "{{ matrix_bridge_mautrix_googlechat_container_image_self_build }}"}
   when: "item.when | bool"
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix Hangots repository ownership is correct on self build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_googlechat_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_googlechat_container_image_self_build | bool"
+
 - name: Ensure Mautrix Hangots repository is present on self build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_googlechat_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-gvoice/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-gvoice/tasks/setup_install.yml
index 163d170b2..f16785a55 100644
--- a/roles/custom/matrix-bridge-mautrix-gvoice/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-gvoice/tasks/setup_install.yml
@@ -57,6 +57,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_gvoice_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix gvoice repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_gvoice_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_gvoice_container_image_self_build | bool"
+
 - name: Ensure Mautrix gvoice repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_gvoice_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-linkedin/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-linkedin/tasks/setup_install.yml
index e6485f386..32957b60c 100644
--- a/roles/custom/matrix-bridge-mautrix-linkedin/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-linkedin/tasks/setup_install.yml
@@ -57,6 +57,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_linkedin_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix linkedin repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_linkedin_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_linkedin_container_image_self_build | bool"
+
 - name: Ensure Mautrix linkedin repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_linkedin_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-meta-instagram/tasks/install.yml b/roles/custom/matrix-bridge-mautrix-meta-instagram/tasks/install.yml
index 9196d8dda..b0771c277 100644
--- a/roles/custom/matrix-bridge-mautrix-meta-instagram/tasks/install.yml
+++ b/roles/custom/matrix-bridge-mautrix-meta-instagram/tasks/install.yml
@@ -58,6 +58,15 @@
 
 - when: matrix_bridge_mautrix_meta_instagram_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure mautrix-meta-instagram repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bridge_mautrix_meta_instagram_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure mautrix-meta-instagram repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bridge_mautrix_meta_instagram_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-meta-messenger/tasks/install.yml b/roles/custom/matrix-bridge-mautrix-meta-messenger/tasks/install.yml
index 633a91f92..7186702a4 100644
--- a/roles/custom/matrix-bridge-mautrix-meta-messenger/tasks/install.yml
+++ b/roles/custom/matrix-bridge-mautrix-meta-messenger/tasks/install.yml
@@ -58,6 +58,15 @@
 
 - when: matrix_bridge_mautrix_meta_messenger_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure mautrix-meta-messenger repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bridge_mautrix_meta_messenger_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure mautrix-meta-messenger repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bridge_mautrix_meta_messenger_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-signal/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-signal/tasks/setup_install.yml
index fd46b3b82..3d6bbbb30 100644
--- a/roles/custom/matrix-bridge-mautrix-signal/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-signal/tasks/setup_install.yml
@@ -64,6 +64,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_signal_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix signal repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_signal_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_signal_container_image_self_build | bool"
+
 - name: Ensure Mautrix signal repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_signal_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-slack/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-slack/tasks/setup_install.yml
index dbb722089..0506c7343 100644
--- a/roles/custom/matrix-bridge-mautrix-slack/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-slack/tasks/setup_install.yml
@@ -58,6 +58,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_slack_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix slack repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_slack_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_slack_container_image_self_build | bool"
+
 - name: Ensure Mautrix slack repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_slack_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-telegram/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-telegram/tasks/setup_install.yml
index 135dec0dc..c6de5c077 100644
--- a/roles/custom/matrix-bridge-mautrix-telegram/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-telegram/tasks/setup_install.yml
@@ -103,6 +103,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_telegram_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix Telegram repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_telegram_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_telegram_container_image_self_build | bool"
+
 - name: Ensure Mautrix Telegram repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_telegram_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-twitter/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-twitter/tasks/setup_install.yml
index 4523ddb75..801039d89 100644
--- a/roles/custom/matrix-bridge-mautrix-twitter/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-twitter/tasks/setup_install.yml
@@ -37,6 +37,16 @@
     - {path: "{{ matrix_bridge_mautrix_twitter_container_src_files_path }}", when: "{{ matrix_bridge_mautrix_twitter_container_image_self_build }}"}
   when: item.when | bool
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix Twitter repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_twitter_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_twitter_enabled | bool and matrix_bridge_mautrix_twitter_container_image_self_build"
+
 - name: Ensure Mautrix Twitter repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_twitter_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mautrix-whatsapp/tasks/setup_install.yml b/roles/custom/matrix-bridge-mautrix-whatsapp/tasks/setup_install.yml
index e0d5370e5..9f1eaaa6e 100644
--- a/roles/custom/matrix-bridge-mautrix-whatsapp/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mautrix-whatsapp/tasks/setup_install.yml
@@ -69,6 +69,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mautrix_whatsapp_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Mautrix Whatsapp repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mautrix_whatsapp_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mautrix_whatsapp_container_image_self_build | bool"
+
 - name: Ensure Mautrix Whatsapp repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mautrix_whatsapp_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mx-puppet-groupme/tasks/setup_install.yml b/roles/custom/matrix-bridge-mx-puppet-groupme/tasks/setup_install.yml
index 6c06a8dae..43aa99d27 100644
--- a/roles/custom/matrix-bridge-mx-puppet-groupme/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mx-puppet-groupme/tasks/setup_install.yml
@@ -82,6 +82,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mx_puppet_groupme_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure MX Puppet Groupme repository ownership is correct on self build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mx_puppet_groupme_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mx_puppet_groupme_enabled | bool and matrix_bridge_mx_puppet_groupme_container_image_self_build"
+
 - name: Ensure MX Puppet Groupme repository is present on self build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mx_puppet_groupme_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-mx-puppet-steam/tasks/setup_install.yml b/roles/custom/matrix-bridge-mx-puppet-steam/tasks/setup_install.yml
index 331a9f019..cf89a245a 100644
--- a/roles/custom/matrix-bridge-mx-puppet-steam/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-mx-puppet-steam/tasks/setup_install.yml
@@ -84,6 +84,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_mx_puppet_steam_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure MX Puppet Steam repository ownership is correct on self build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_mx_puppet_steam_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_mx_puppet_steam_enabled | bool and matrix_bridge_mx_puppet_steam_container_image_self_build"
+
 - name: Ensure MX Puppet Steam repository is present on self build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_mx_puppet_steam_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-postmoogle/tasks/setup_install.yml b/roles/custom/matrix-bridge-postmoogle/tasks/setup_install.yml
index ac4d3a862..8b2c703da 100644
--- a/roles/custom/matrix-bridge-postmoogle/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-postmoogle/tasks/setup_install.yml
@@ -88,6 +88,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_bridge_postmoogle_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure postmoogle repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_postmoogle_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_postmoogle_container_image_self_build | bool"
+
 - name: Ensure postmoogle repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_postmoogle_container_repo }}"
diff --git a/roles/custom/matrix-bridge-rustpush/tasks/setup_install.yml b/roles/custom/matrix-bridge-rustpush/tasks/setup_install.yml
index 97df25f14..21e3302b4 100644
--- a/roles/custom/matrix-bridge-rustpush/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-rustpush/tasks/setup_install.yml
@@ -19,6 +19,16 @@
     - {path: "{{ matrix_bridge_rustpush_container_src_files_path }}", when: "{{ matrix_bridge_rustpush_container_image_self_build }}"}
   when: item.when | bool
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure RustPush repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_rustpush_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_rustpush_enabled | bool and matrix_bridge_rustpush_container_image_self_build"
+
 - name: Ensure RustPush repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_rustpush_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-steam/tasks/setup_install.yml b/roles/custom/matrix-bridge-steam/tasks/setup_install.yml
index 725489512..33c8de1fa 100644
--- a/roles/custom/matrix-bridge-steam/tasks/setup_install.yml
+++ b/roles/custom/matrix-bridge-steam/tasks/setup_install.yml
@@ -31,6 +31,16 @@
     - {path: "{{ matrix_bridge_steam_container_src_files_path }}", when: "{{ matrix_bridge_steam_container_image_self_build }}"}
   when: item.when | bool
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Steam bridge repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_bridge_steam_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_bridge_steam_enabled | bool and matrix_bridge_steam_container_image_self_build"
+
 - name: Ensure Steam bridge repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_bridge_steam_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-bridge-wechat/tasks/install.yml b/roles/custom/matrix-bridge-wechat/tasks/install.yml
index 48840f1de..890dd8d87 100644
--- a/roles/custom/matrix-bridge-wechat/tasks/install.yml
+++ b/roles/custom/matrix-bridge-wechat/tasks/install.yml
@@ -32,6 +32,15 @@
 
 - when: matrix_bridge_wechat_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure WeChat Bridge repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bridge_wechat_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure WeChat Bridge repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bridge_wechat_container_image_self_build_repo }}"
@@ -63,6 +72,15 @@
 
 - when: matrix_bridge_wechat_agent_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure WeChat Agent repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_bridge_wechat_agent_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure WeChat Agent repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_bridge_wechat_agent_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-cactus-comments/tasks/setup_install.yml b/roles/custom/matrix-cactus-comments/tasks/setup_install.yml
index e5b47207f..2e3e3546a 100644
--- a/roles/custom/matrix-cactus-comments/tasks/setup_install.yml
+++ b/roles/custom/matrix-cactus-comments/tasks/setup_install.yml
@@ -47,6 +47,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_cactus_comments_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure matrix-cactus-comments repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_cactus_comments_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_cactus_comments_container_image_self_build | bool"
+
 - name: Ensure matrix-cactus-comments repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_cactus_comments_container_repo }}"
diff --git a/roles/custom/matrix-client-commet/tasks/setup_install.yml b/roles/custom/matrix-client-commet/tasks/setup_install.yml
index 0eec9001a..15515b4a4 100644
--- a/roles/custom/matrix-client-commet/tasks/setup_install.yml
+++ b/roles/custom/matrix-client-commet/tasks/setup_install.yml
@@ -40,6 +40,15 @@
       when: not matrix_client_commet_git_config_file_stat.stat.exists
       become: true
 
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure Commet repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_client_commet_container_src_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure Commet repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_client_commet_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-client-element/tasks/prepare_themes.yml b/roles/custom/matrix-client-element/tasks/prepare_themes.yml
index 56ddb3403..133c8a803 100644
--- a/roles/custom/matrix-client-element/tasks/prepare_themes.yml
+++ b/roles/custom/matrix-client-element/tasks/prepare_themes.yml
@@ -15,11 +15,17 @@
   delegate_to: 127.0.0.1
   become: false
   block:
+    # This checkout lives on the Ansible controller, so we cannot correct its ownership like we do for checkouts on the server.
+    # Marking it as a safe directory keeps git's dubious-ownership protection from failing the task when the playbook directory belongs to another user.
     - name: Ensure Element Web themes repository is pulled
       ansible.builtin.git:
         repo: "{{ matrix_client_element_themes_repository_url }}"
         version: "{{ matrix_client_element_themes_repository_version }}"
         dest: "{{ role_path }}/files/scratchpad/themes"
+      environment:
+        GIT_CONFIG_COUNT: "1"
+        GIT_CONFIG_KEY_0: safe.directory
+        GIT_CONFIG_VALUE_0: "{{ role_path }}/files/scratchpad/themes"
 
     - name: Find all Element Web theme files
       ansible.builtin.find:
diff --git a/roles/custom/matrix-client-element/tasks/setup_install.yml b/roles/custom/matrix-client-element/tasks/setup_install.yml
index bd6728e21..116d50f89 100644
--- a/roles/custom/matrix-client-element/tasks/setup_install.yml
+++ b/roles/custom/matrix-client-element/tasks/setup_install.yml
@@ -33,6 +33,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_client_element_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Element Web repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_client_element_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_client_element_container_image_self_build | bool"
+
 - name: Ensure Element Web repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_client_element_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-client-fluffychat/tasks/setup_install.yml b/roles/custom/matrix-client-fluffychat/tasks/setup_install.yml
index 44791239f..851d94a03 100644
--- a/roles/custom/matrix-client-fluffychat/tasks/setup_install.yml
+++ b/roles/custom/matrix-client-fluffychat/tasks/setup_install.yml
@@ -29,6 +29,15 @@
 
 - when: "matrix_client_fluffychat_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure FluffyChat Web repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_client_fluffychat_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure FluffyChat Web repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_client_fluffychat_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-client-schildichat/tasks/prepare_themes.yml b/roles/custom/matrix-client-schildichat/tasks/prepare_themes.yml
index 4c2167bcd..0402e4bba 100644
--- a/roles/custom/matrix-client-schildichat/tasks/prepare_themes.yml
+++ b/roles/custom/matrix-client-schildichat/tasks/prepare_themes.yml
@@ -14,11 +14,17 @@
   delegate_to: 127.0.0.1
   become: false
   block:
+    # This checkout lives on the Ansible controller, so we cannot correct its ownership like we do for checkouts on the server.
+    # Marking it as a safe directory keeps git's dubious-ownership protection from failing the task when the playbook directory belongs to another user.
     - name: Ensure SchildiChat Web themes repository is pulled
       ansible.builtin.git:
         repo: "{{ matrix_client_schildichat_themes_repository_url }}"
         version: "{{ matrix_client_schildichat_themes_repository_version }}"
         dest: "{{ role_path }}/files/scratchpad/themes"
+      environment:
+        GIT_CONFIG_COUNT: "1"
+        GIT_CONFIG_KEY_0: safe.directory
+        GIT_CONFIG_VALUE_0: "{{ role_path }}/files/scratchpad/themes"
 
     - name: Find all SchildiChat Web theme files
       ansible.builtin.find:
diff --git a/roles/custom/matrix-client-schildichat/tasks/setup_install.yml b/roles/custom/matrix-client-schildichat/tasks/setup_install.yml
index d6de88274..e421fdb0c 100644
--- a/roles/custom/matrix-client-schildichat/tasks/setup_install.yml
+++ b/roles/custom/matrix-client-schildichat/tasks/setup_install.yml
@@ -32,6 +32,15 @@
 
 - when: "matrix_client_schildichat_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure SchildiChat Web repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_client_schildichat_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure SchildiChat Web repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_client_schildichat_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-corporal/tasks/setup_install.yml b/roles/custom/matrix-corporal/tasks/setup_install.yml
index 271089e85..ede0b2b7a 100644
--- a/roles/custom/matrix-corporal/tasks/setup_install.yml
+++ b/roles/custom/matrix-corporal/tasks/setup_install.yml
@@ -24,6 +24,16 @@
     - "{{ matrix_corporal_cache_dir_path }}"
     - "{{ matrix_corporal_var_dir_path }}"
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Matrix Corporal repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_corporal_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: matrix_corporal_container_image_self_build | bool
+
 - name: Ensure Matrix Corporal repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_corporal_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-dendrite/tasks/setup_install.yml b/roles/custom/matrix-dendrite/tasks/setup_install.yml
index 667a6f5b4..ef5735254 100644
--- a/roles/custom/matrix-dendrite/tasks/setup_install.yml
+++ b/roles/custom/matrix-dendrite/tasks/setup_install.yml
@@ -91,6 +91,15 @@
 
 - when: "matrix_dendrite_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure Dendrite repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_dendrite_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure Dendrite repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_dendrite_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-element-admin/tasks/install.yml b/roles/custom/matrix-element-admin/tasks/install.yml
index 5539807f7..c54ac9c8d 100644
--- a/roles/custom/matrix-element-admin/tasks/install.yml
+++ b/roles/custom/matrix-element-admin/tasks/install.yml
@@ -43,6 +43,15 @@
 
 - when: matrix_element_admin_container_image_self_build | bool
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure Element Admin repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_element_admin_container_src_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure Element Admin repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_element_admin_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-ketesa/tasks/setup_install.yml b/roles/custom/matrix-ketesa/tasks/setup_install.yml
index e112e0cc2..d0bec5633 100644
--- a/roles/custom/matrix-ketesa/tasks/setup_install.yml
+++ b/roles/custom/matrix-ketesa/tasks/setup_install.yml
@@ -80,6 +80,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_ketesa_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure matrix-ketesa repository ownership is correct when self-building
+  ansible.builtin.file:
+    path: "{{ matrix_ketesa_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: matrix_ketesa_container_image_self_build | bool
+
 - name: Ensure matrix-ketesa repository is present when self-building
   ansible.builtin.git:
     repo: "{{ matrix_ketesa_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-livekit-jwt-service/tasks/install.yml b/roles/custom/matrix-livekit-jwt-service/tasks/install.yml
index 18e09891d..bf369b5df 100644
--- a/roles/custom/matrix-livekit-jwt-service/tasks/install.yml
+++ b/roles/custom/matrix-livekit-jwt-service/tasks/install.yml
@@ -40,6 +40,15 @@
 
 - when: "matrix_livekit_jwt_service_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure LiveKit JWT Service repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_livekit_jwt_service_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure LiveKit JWT Service repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_livekit_jwt_service_container_repo }}"
diff --git a/roles/custom/matrix-matrixto/tasks/install.yml b/roles/custom/matrix-matrixto/tasks/install.yml
index 6abed3110..3da68b309 100644
--- a/roles/custom/matrix-matrixto/tasks/install.yml
+++ b/roles/custom/matrix-matrixto/tasks/install.yml
@@ -26,12 +26,23 @@
     - labels
   register: matrix_matrixto_support_files_result
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Matrix.to repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_matrixto_container_image_self_build_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+
 - name: Ensure Matrix.to repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_matrixto_container_image_self_build_repo }}"
     version: "{{ matrix_matrixto_container_image_self_build_repo_version }}"
     dest: "{{ matrix_matrixto_container_image_self_build_src_files_path }}"
     force: "yes"
+  become: true
+  become_user: "{{ matrix_user_name }}"
   register: matrix_matrixto_git_pull_results
 
 - name: Ensure Matrix.to container image is built
diff --git a/roles/custom/matrix-media-repo/tasks/setup_install.yml b/roles/custom/matrix-media-repo/tasks/setup_install.yml
index 094bdf31e..43155e687 100755
--- a/roles/custom/matrix-media-repo/tasks/setup_install.yml
+++ b/roles/custom/matrix-media-repo/tasks/setup_install.yml
@@ -58,6 +58,15 @@
 
 - when: "matrix_media_repo_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure media-repo repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_media_repo_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure media-repo repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_media_repo_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-pantalaimon/tasks/install.yml b/roles/custom/matrix-pantalaimon/tasks/install.yml
index 8f19974be..618a22d5e 100644
--- a/roles/custom/matrix-pantalaimon/tasks/install.yml
+++ b/roles/custom/matrix-pantalaimon/tasks/install.yml
@@ -37,6 +37,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_pantalaimon_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure pantalaimon repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_pantalaimon_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_pantalaimon_container_image_self_build | bool"
+
 - name: Ensure pantalaimon repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_pantalaimon_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-rageshake/tasks/install.yml b/roles/custom/matrix-rageshake/tasks/install.yml
index e2636066a..31e5fdcba 100644
--- a/roles/custom/matrix-rageshake/tasks/install.yml
+++ b/roles/custom/matrix-rageshake/tasks/install.yml
@@ -51,6 +51,16 @@
   delay: "{{ devture_playbook_help_container_retries_delay }}"
   until: matrix_rageshake_container_image_pull_result is not failed
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure rageshake repository ownership is correct on self-build
+  ansible.builtin.file:
+    path: "{{ matrix_rageshake_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_rageshake_container_image_self_build | bool"
+
 - name: Ensure rageshake repository is present on self-build
   ansible.builtin.git:
     repo: "{{ matrix_rageshake_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-synapse-auto-compressor/tasks/install.yml b/roles/custom/matrix-synapse-auto-compressor/tasks/install.yml
index 5fea7dc00..e64a32aaa 100644
--- a/roles/custom/matrix-synapse-auto-compressor/tasks/install.yml
+++ b/roles/custom/matrix-synapse-auto-compressor/tasks/install.yml
@@ -51,6 +51,15 @@
 
 - when: "matrix_synapse_auto_compressor_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure synapse-auto-compressor repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_synapse_auto_compressor_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_user_name }}"
+        group: "{{ matrix_group_name }}"
+        recurse: true
+
     - name: Ensure synapse-auto-compressor repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_synapse_auto_compressor_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-synapse/tasks/ext/mjolnir-antispam/setup_install.yml b/roles/custom/matrix-synapse/tasks/ext/mjolnir-antispam/setup_install.yml
index d6c8429d5..0b3f191e4 100644
--- a/roles/custom/matrix-synapse/tasks/ext/mjolnir-antispam/setup_install.yml
+++ b/roles/custom/matrix-synapse/tasks/ext/mjolnir-antispam/setup_install.yml
@@ -12,11 +12,21 @@
     name: git
     state: present
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure mjolnir-antispam repository ownership is correct
+  ansible.builtin.file:
+    path: "{{ matrix_synapse_ext_path }}/mjolnir"
+    state: directory
+    owner: "{{ matrix_synapse_uid }}"
+    group: "{{ matrix_synapse_gid }}"
+    recurse: true
+
 - name: Clone mjolnir-antispam git repository
   ansible.builtin.git:
     repo: "{{ matrix_synapse_ext_spam_checker_mjolnir_antispam_git_repository_url }}"
     version: "{{ matrix_synapse_ext_spam_checker_mjolnir_antispam_git_version }}"
     dest: "{{ matrix_synapse_ext_path }}/mjolnir"
+    force: "yes"
   become: true
   become_user: "{{ matrix_synapse_username }}"
 
diff --git a/roles/custom/matrix-synapse/tasks/ext/synapse-http-antispam/setup_install.yml b/roles/custom/matrix-synapse/tasks/ext/synapse-http-antispam/setup_install.yml
index f7ce74096..56e7a1c5d 100644
--- a/roles/custom/matrix-synapse/tasks/ext/synapse-http-antispam/setup_install.yml
+++ b/roles/custom/matrix-synapse/tasks/ext/synapse-http-antispam/setup_install.yml
@@ -10,11 +10,21 @@
     name: git
     state: present
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure synapse-http-antispam repository ownership is correct
+  ansible.builtin.file:
+    path: "{{ matrix_synapse_ext_path }}/synapse-http-antispam"
+    state: directory
+    owner: "{{ matrix_synapse_uid }}"
+    group: "{{ matrix_synapse_gid }}"
+    recurse: true
+
 - name: Clone synapse-http-antispam git repository
   ansible.builtin.git:
     repo: "{{ matrix_synapse_ext_synapse_http_antispam_git_repository_url }}"
     version: "{{ matrix_synapse_ext_synapse_http_antispam_git_version }}"
     dest: "{{ matrix_synapse_ext_path }}/synapse-http-antispam"
+    force: "yes"
   become: true
   become_user: "{{ matrix_synapse_username }}"
 
diff --git a/roles/custom/matrix-synapse/tasks/ext/synapse-simple-antispam/setup_install.yml b/roles/custom/matrix-synapse/tasks/ext/synapse-simple-antispam/setup_install.yml
index 2a5a24b2b..13b587a9b 100644
--- a/roles/custom/matrix-synapse/tasks/ext/synapse-simple-antispam/setup_install.yml
+++ b/roles/custom/matrix-synapse/tasks/ext/synapse-simple-antispam/setup_install.yml
@@ -19,11 +19,21 @@
     name: git
     state: present
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure synapse-simple-antispam repository ownership is correct
+  ansible.builtin.file:
+    path: "{{ matrix_synapse_ext_path }}/synapse-simple-antispam"
+    state: directory
+    owner: "{{ matrix_synapse_uid }}"
+    group: "{{ matrix_synapse_gid }}"
+    recurse: true
+
 - name: Clone synapse-simple-antispam git repository
   ansible.builtin.git:
     repo: "{{ matrix_synapse_ext_spam_checker_synapse_simple_antispam_git_repository_url }}"
     version: "{{ matrix_synapse_ext_spam_checker_synapse_simple_antispam_git_version }}"
     dest: "{{ matrix_synapse_ext_path }}/synapse-simple-antispam"
+    force: "yes"
   become: true
   become_user: "{{ matrix_synapse_username }}"
 
diff --git a/roles/custom/matrix-synapse/tasks/synapse/setup_install.yml b/roles/custom/matrix-synapse/tasks/synapse/setup_install.yml
index c0cdae581..a5daf50a9 100644
--- a/roles/custom/matrix-synapse/tasks/synapse/setup_install.yml
+++ b/roles/custom/matrix-synapse/tasks/synapse/setup_install.yml
@@ -35,6 +35,15 @@
 
 - when: "matrix_synapse_container_image_self_build | bool"
   block:
+    # A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+    - name: Ensure Synapse repository ownership is correct on self-build
+      ansible.builtin.file:
+        path: "{{ matrix_synapse_container_src_files_path }}"
+        state: directory
+        owner: "{{ matrix_synapse_uid }}"
+        group: "{{ matrix_synapse_gid }}"
+        recurse: true
+
     - name: Ensure Synapse repository is present on self-build
       ansible.builtin.git:
         repo: "{{ matrix_synapse_container_image_self_build_repo }}"
diff --git a/roles/custom/matrix-user-verification-service/tasks/setup_install.yml b/roles/custom/matrix-user-verification-service/tasks/setup_install.yml
index ca810c3cd..533380c7c 100644
--- a/roles/custom/matrix-user-verification-service/tasks/setup_install.yml
+++ b/roles/custom/matrix-user-verification-service/tasks/setup_install.yml
@@ -28,6 +28,16 @@
   until: matrix_user_verification_service_container_image_pull_result is not failed
   when: "not matrix_user_verification_service_container_image_self_build | bool"
 
+# A checkout owned by a different user (a uid change, an earlier clone by another user, etc.) would make the git task below fail on ownership or permissions.
+- name: Ensure Matrix User Verification Service repository ownership is correct when self-building
+  ansible.builtin.file:
+    path: "{{ matrix_user_verification_service_container_src_files_path }}"
+    state: directory
+    owner: "{{ matrix_user_name }}"
+    group: "{{ matrix_group_name }}"
+    recurse: true
+  when: "matrix_user_verification_service_container_image_self_build | bool"
+
 - name: Ensure Matrix User Verification Service repository is present when self-building
   ansible.builtin.git:
     repo: "{{ matrix_user_verification_service_container_image_self_build_repo }}"