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

roles/matrix-bridge-mx-puppet-skype/defaults/main.yml

@@ -4,6 +4,7 @@
 matrix_mx_puppet_skype_enabled: true
 
 matrix_mx_puppet_skype_container_image_self_build: false
+matrix_mx_puppet_skype_container_image_self_build_repo: "https://github.com/Sorunome/mx-puppet-skype.git"
 
 matrix_mx_puppet_skype_docker_image: "{{ matrix_mx_puppet_skype_docker_image_name_prefix }}sorunome/mx-puppet-skype:latest"
 matrix_mx_puppet_skype_docker_image_name_prefix: "{{ 'localhost/' if matrix_mx_puppet_skype_container_image_self_build else 'docker.io/' }}"

roles/matrix-bridge-mx-puppet-skype/tasks/setup_install.yml

@@ -32,7 +32,7 @@
 
 - name: Ensure MX Puppet Skype repository is present on self build
   git:
-    repo: https://github.com/Sorunome/mx-puppet-skype.git
+    repo: "{{ matrix_mx_puppet_skype_container_image_self_build_repo }}"
     dest: "{{ matrix_mx_puppet_skype_docker_src_files_path }}"
     force: "yes"
   register: matrix_mx_puppet_skype_git_pull_results