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-bridge-appservice-irc/defaults/main.yml

@@ -14,10 +14,11 @@ matrix_appservice_irc_docker_src_files_path: "{{ matrix_base_data_path }}/appser
 # renovate: datasource=docker depName=docker.io/matrixdotorg/matrix-appservice-irc
 matrix_appservice_irc_version: 1.0.1
 matrix_appservice_irc_docker_image: "{{ matrix_appservice_irc_docker_image_registry_prefix }}matrixdotorg/matrix-appservice-irc:{{ matrix_appservice_irc_docker_image_tag }}"
-matrix_appservice_irc_docker_image_registry_prefix: docker.io/
+matrix_appservice_irc_docker_image_registry_prefix: "{{ 'localhost/' if matrix_appservice_irc_container_image_self_build else matrix_appservice_irc_docker_image_registry_prefix_upstream }}"
+matrix_appservice_irc_docker_image_registry_prefix_upstream: "{{ matrix_appservice_irc_docker_image_registry_prefix_upstream_default }}"
+matrix_appservice_irc_docker_image_registry_prefix_upstream_default: docker.io/
 matrix_appservice_irc_docker_image_tag: "{{ 'latest' if matrix_appservice_irc_version == 'latest' else ('release-' + matrix_appservice_irc_version) }}"
 matrix_appservice_irc_docker_image_force_pull: "{{ matrix_appservice_irc_docker_image.endswith(':latest') }}"
-matrix_appservice_irc_docker_image_name_prefix: "{{ 'localhost/' if matrix_appservice_irc_container_image_self_build else 'docker.io/' }}"
 
 matrix_appservice_irc_base_path: "{{ matrix_base_data_path }}/appservice-irc"
 matrix_appservice_irc_config_path: "{{ matrix_appservice_irc_base_path }}/config"

roles/custom/matrix-bridge-appservice-irc/tasks/validate_config.yml

@@ -37,3 +37,4 @@
   with_items:
     - {'old': 'matrix_appservice_irc_container_expose_client_server_api_port', 'new': '<superseded by matrix_appservice_irc_container_http_host_bind_port>'}
     - {'old': 'matrix_appservice_irc_container_self_build', 'new': 'matrix_appservice_irc_container_image_self_build'}
+    - {'old': 'matrix_appservice_irc_docker_image_name_prefix', 'new': 'matrix_appservice_irc_docker_image_registry_prefix'}