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-go-skype-bridge/defaults/main.yml

@@ -10,8 +10,10 @@ matrix_go_skype_bridge_container_image_self_build_branch: "{{ 'master' if matrix
 
 # renovate: datasource=docker depName=nodefyme/go-skype-bridge
 matrix_go_skype_bridge_version: latest
-matrix_go_skype_bridge_docker_image: "{{ matrix_go_skype_bridge_docker_image_name_prefix }}nodefyme/go-skype-bridge:{{ matrix_go_skype_bridge_version }}"
-matrix_go_skype_bridge_docker_image_name_prefix: "{{ 'localhost/' if matrix_go_skype_bridge_container_image_self_build else 'docker.io/' }}"
+matrix_go_skype_bridge_docker_image: "{{ matrix_go_skype_bridge_docker_image_registry_prefix }}nodefyme/go-skype-bridge:{{ matrix_go_skype_bridge_version }}"
+matrix_go_skype_bridge_docker_image_registry_prefix: "{{ 'localhost/' if matrix_go_skype_bridge_container_image_self_build else matrix_go_skype_bridge_docker_image_registry_prefix_upstream }}"
+matrix_go_skype_bridge_docker_image_registry_prefix_upstream: "{{ matrix_go_skype_bridge_docker_image_registry_prefix_upstream_default }}"
+matrix_go_skype_bridge_docker_image_registry_prefix_upstream_default: "docker.io/"
 matrix_go_skype_bridge_docker_image_force_pull: "{{ matrix_go_skype_bridge_docker_image.endswith(':latest') }}"
 
 matrix_go_skype_bridge_base_path: "{{ matrix_base_data_path }}/go-skype-bridge"

roles/custom/matrix-bridge-go-skype-bridge/tasks/validate_config.yml

@@ -11,3 +11,12 @@
     - {'name': 'matrix_go_skype_bridge_homeserver_token', when: true}
     - {'name': 'matrix_go_skype_bridge_database_hostname', when: "{{ matrix_go_skype_bridge_database_engine == 'postgres' }}"}
     - {'name': 'matrix_go_skype_bridge_container_network', when: true}
+
+- name: (Deprecation) Catch and report renamed go-skype-bridge variables
+  ansible.builtin.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_go_skype_bridge_docker_image_name_prefix', 'new': 'matrix_go_skype_bridge_docker_image_registry_prefix'}