Move self-building git repository URLs to variables (stop hardcoding)

roles/matrix-coturn/defaults/main.yml

@@ -1,6 +1,7 @@
 matrix_coturn_enabled: true
 
 matrix_coturn_container_image_self_build: false
+matrix_coturn_container_image_self_build_repo: "https://github.com/instrumentisto/coturn-docker-image.git"
 
 matrix_coturn_docker_image: "{{ matrix_coturn_docker_image_name_prefix }}instrumentisto/coturn:4.5.1.3"
 matrix_coturn_docker_image_name_prefix: "{{ 'localhost/' if matrix_coturn_container_image_self_build else 'docker.io/' }}"

roles/matrix-coturn/tasks/setup_coturn.yml

@@ -25,7 +25,7 @@
 
 - name: Ensure Coturn repository is present on self-build
   git:
-    repo: https://github.com/instrumentisto/coturn-docker-image.git
+    repo: "{{ matrix_coturn_container_image_self_build_repo }}"
     dest: "{{ matrix_coturn_docker_src_files_path }}"
     version: "{{ matrix_coturn_docker_image.split(':')[1] }}"
     force: "yes"