Rework all roles to include component_(docker|container)_image_registry_prefix* variables

This:

- brings consistency - no more mixing `_name_prefix` and `_registry_prefix`
- adds extensibility - a future patch will allow reconfiguring all registry prefixes for all roles in the playbook

We still have `_docker_` vs `_container_` inconsistencies.
These may be worked on later.

roles/custom/matrix-client-cinny/defaults/main.yml

@@ -8,8 +8,10 @@ matrix_client_cinny_container_image_self_build_repo: "https://github.com/ajbura/
 
 # renovate: datasource=docker depName=ajbura/cinny
 matrix_client_cinny_version: v4.4.0
-matrix_client_cinny_docker_image: "{{ matrix_client_cinny_docker_image_name_prefix }}ajbura/cinny:{{ matrix_client_cinny_version }}"
-matrix_client_cinny_docker_image_name_prefix: "{{ 'localhost/' if matrix_client_cinny_container_image_self_build else 'docker.io/' }}"
+matrix_client_cinny_docker_image: "{{ matrix_client_cinny_docker_image_registry_prefix }}ajbura/cinny:{{ matrix_client_cinny_version }}"
+matrix_client_cinny_docker_image_registry_prefix: "{{ 'localhost/' if matrix_client_cinny_container_image_self_build else matrix_client_cinny_docker_image_registry_prefix_upstream }}"
+matrix_client_cinny_docker_image_registry_prefix_upstream: "{{ matrix_client_cinny_docker_image_registry_prefix_upstream_default }}"
+matrix_client_cinny_docker_image_registry_prefix_upstream_default: docker.io/
 matrix_client_cinny_docker_image_force_pull: "{{ matrix_client_cinny_docker_image.endswith(':latest') }}"
 
 matrix_client_cinny_data_path: "{{ matrix_base_data_path }}/client-cinny"

roles/custom/matrix-client-cinny/tasks/validate_config.yml

@@ -9,6 +9,14 @@
     - {'name': 'matrix_client_cinny_container_network', when: true}
     - {'name': 'matrix_client_cinny_container_labels_traefik_compression_middleware_name', when: "{{ matrix_client_cinny_container_labels_traefik_compression_middleware_enabled }}"}
 
+- name: (Deprecation) Catch and report renamed Cinny variables
+  ansible.builtin.fail:
+    msg: >-
+      The variable `{{ item.old }}` is deprecated. Please use `{{ item.new }}` instead.
+  when: "item.old in vars"
+  with_items:
+    - {'old': 'matrix_client_cinny_container_image_name_prefix', 'new': 'matrix_client_cinny_container_image_registry_prefix'}
+
 - name: Fail if matrix_client_cinny_path_prefix is not /
   ansible.builtin.fail:
     msg: >-