add validation for changed continuwuity variable names

roles/custom/matrix-continuwuity/tasks/validate_config.yml

@@ -13,3 +13,18 @@
     - {'name': 'matrix_continuwuity_hostname', when: true}
     - {'name': 'matrix_continuwuity_container_network', when: true}
     - {'name': 'matrix_continuwuity_container_labels_internal_client_api_traefik_entrypoints', when: "{{ matrix_continuwuity_container_labels_internal_client_api_enabled }}"}
+
+- name: (Deprecation) Catch and report renamed Continuwuity settings
+  ansible.builtin.fail:
+    msg: >-
+      Your configuration contains a variable, which now has a different name.
+      Please rename the variable (`{{ item.old }}` -> `{{ item.new }}`) on your configuration file (vars.yml).
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_continuwuity_allowed_remote_server_names', 'new': 'matrix_continuwuity_config_allowed_remote_server_names'}
+    - {'old': 'matrix_continuwuity_forbidden_remote_room_directory_server_names', 'new': 'matrix_continuwuity_config_forbidden_remote_room_directory_server_names'}
+    - {'old': 'matrix_continuwuity_forbidden_remote_server_names', 'new': 'matrix_continuwuity_config_forbidden_remote_server_names'}
+    - {'old': 'matrix_continuwuity_ignore_messages_from_server_names', 'new': 'matrix_continuwuity_config_ignore_messages_from_server_names'}
+    - {'old': 'matrix_continuwuity_prevent_media_downloads_from', 'new': 'matrix_continuwuity_config_prevent_media_downloads_from'}
+    - {'old': 'matrix_continuwuity_trusted_servers', 'new': 'matrix_continuwuity_config_trusted_servers'}
+    - {'old': 'matrix_continuwuity_url_preview_domain_contains_allowlist', 'new': 'matrix_continuwuity_config_url_preview_domain_contains_allowlist'}