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-mautrix-discord/defaults/main.yml

@@ -16,8 +16,10 @@ matrix_mautrix_discord_container_image_self_build_branch: "{{ 'main' if matrix_m
 matrix_mautrix_discord_version: v0.7.2
 
 # See: https://mau.dev/mautrix/discord/container_registry
-matrix_mautrix_discord_docker_image: "{{ matrix_mautrix_discord_docker_image_name_prefix }}mautrix/discord:{{ matrix_mautrix_discord_version }}"
-matrix_mautrix_discord_docker_image_name_prefix: "{{ 'localhost/' if matrix_mautrix_discord_container_image_self_build else 'dock.mau.dev/' }}"
+matrix_mautrix_discord_docker_image: "{{ matrix_mautrix_discord_docker_image_registry_prefix }}mautrix/discord:{{ matrix_mautrix_discord_version }}"
+matrix_mautrix_discord_docker_image_registry_prefix: "{{ 'localhost/' if matrix_mautrix_discord_container_image_self_build else matrix_mautrix_discord_docker_image_registry_prefix_upstream }}"
+matrix_mautrix_discord_docker_image_registry_prefix_upstream: "{{ matrix_mautrix_discord_docker_image_registry_prefix_upstream_default }}"
+matrix_mautrix_discord_docker_image_registry_prefix_upstream_default: "dock.mau.dev/"
 matrix_mautrix_discord_docker_image_force_pull: "{{ matrix_mautrix_discord_docker_image.endswith(':latest') }}"
 
 matrix_mautrix_discord_base_path: "{{ matrix_base_data_path }}/mautrix-discord"

roles/custom/matrix-bridge-mautrix-discord/tasks/validate_config.yml

@@ -15,7 +15,7 @@
     - {'name': 'matrix_mautrix_discord_container_labels_avatar_proxy_hostname', when: "{{ matrix_mautrix_discord_container_labels_avatar_proxy_enabled }}"}
     - {'name': 'matrix_mautrix_discord_container_labels_avatar_proxy_path_prefix', when: "{{ matrix_mautrix_discord_container_labels_avatar_proxy_enabled }}"}
 
-- name: (Deprecation) Catch and report renamed settings
+- name: (Deprecation) Catch and report renamed mautrix-discord settings
   ansible.builtin.fail:
     msg: >-
       Your configuration contains a variable, which now has a different name.
@@ -25,3 +25,4 @@
     - {'old': 'matrix_mautrix_discord_login_shared_secret', 'new': '<removed>'}
     - {'old': 'matrix_mautrix_discord_homeserver_public_address', 'new': 'matrix_mautrix_discord_bridge_public_address'}
     - {'old': 'matrix_mautrix_discord_command_prefix', 'new': 'matrix_mautrix_discord_bridge_command_prefix'}
+    - {'old': 'matrix_mautrix_discord_docker_image_name_prefix', 'new': 'matrix_mautrix_discord_docker_image_registry_prefix'}