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

roles/matrix-synapse-admin/tasks/main.yml

@@ -2,6 +2,12 @@
   tags:
     - always
 
+- import_tasks: "{{ role_path }}/tasks/validate_config.yml"
+  when: run_setup|bool
+  tags:
+    - setup-all
+    - setup-synapse-admin
+
 - import_tasks: "{{ role_path }}/tasks/setup.yml"
   tags:
     - setup-all

roles/matrix-synapse-admin/tasks/setup.yml

@@ -14,7 +14,7 @@
 
 - name: Ensure matrix-synapse-admin repository is present when self-building
   git:
-    repo: "{{ matrix_synapse_admin_docker_repo }}"
+    repo: "{{ matrix_synapse_admin_container_self_build_repo }}"
     dest: "{{ matrix_synapse_admin_docker_src_files_path }}"
     force: "yes"
   register: matrix_synapse_admin_git_pull_results

roles/matrix-synapse-admin/tasks/validate_config.yml

@@ -0,0 +1,10 @@
+---
+
+- name: (Deprecation) Catch and report renamed settings
+  fail:
+    msg: >-
+      Your configuration contains a variable, which now has a different name.
+      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_synapse_admin_docker_repo', 'new': 'matrix_synapse_admin_container_self_build_repo'}