Fix self-building for Coturn

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1023

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1009

roles/matrix-coturn/defaults/main.yml

@@ -1,7 +1,9 @@
 matrix_coturn_enabled: true
 
 matrix_coturn_container_image_self_build: false
-matrix_coturn_container_image_self_build_repo: "https://github.com/coturn/coturn/tree/master/docker/coturn/alpine.git"
+matrix_coturn_container_image_self_build_repo: "https://github.com/coturn/coturn"
+matrix_coturn_container_image_self_build_repo_version: "upstream/{{ matrix_coturn_version }}"
+matrix_coturn_container_image_self_build_repo_dockerfile_path: "docker/coturn/alpine/Dockerfile"
 
 matrix_coturn_version: 4.5.2
 matrix_coturn_docker_image: "{{ matrix_coturn_docker_image_name_prefix }}coturn/coturn:{{ matrix_coturn_version }}-alpine"

roles/matrix-coturn/tasks/setup_install.yml

@@ -30,7 +30,7 @@
       git:
         repo: "{{ matrix_coturn_container_image_self_build_repo }}"
         dest: "{{ matrix_coturn_docker_src_files_path }}"
-        version: "{{ matrix_coturn_docker_image.split(':')[1] }}"
+        version: "{{ matrix_coturn_container_image_self_build_repo_version }}"
         force: "yes"
       register: matrix_coturn_git_pull_results
 
@@ -40,7 +40,7 @@
         source: build
         force_source: "{{ matrix_coturn_git_pull_results.changed }}"
         build:
-          dockerfile: Dockerfile
+          dockerfile: "{{ matrix_coturn_container_image_self_build_repo_dockerfile_path }}"
           path: "{{ matrix_coturn_docker_src_files_path }}"
           pull: yes
   when: "matrix_coturn_container_image_self_build|bool"