Make matrix-nginx-proxy role independent of others

The matrix-nginx-proxy role can now be used independently.
This makes it consistent with all other roles, with
the `matrix-base` role remaining as their only dependency.

Separating matrix-nginx-proxy was relatively straightforward, with
the exception of the Mautrix Telegram reverse-proxying configuration.
Mautrix Telegram, being an extension/bridge, does not feel important enough
to justify its own special handling in matrix-nginx-proxy.

Thus, we've introduced the concept of "additional configuration blocks"
(`matrix_nginx_proxy_proxy_matrix_additional_server_configuration_blocks`),
where any module can register its own custom nginx server blocks.

For such dynamic registration to work, the order of role execution
becomes important. To make it possible for each module participating
in dynamic registration to verify that the order of execution is
correct, we've also introduced a `matrix_nginx_proxy_role_executed`
variable.

It should be noted that this doesn't make the matrix-synapse role
dependent on matrix-nginx-proxy. It's optional runtime detection
and registration, and it only happens in the matrix-synapse role
when `matrix_mautrix_telegram_enabled: true`.

roles/matrix-nginx-proxy/tasks/main.yml

@@ -2,6 +2,15 @@
   tags:
     - always
 
+# Always validating the configuration, even if `matrix_nginx_proxy: false`.
+# This role performs actions even if the role is disabled, so we need
+# to ensure there's a valid configuration in any case.
+- import_tasks: "{{ role_path }}/tasks/validate_config.yml"
+  when: run_setup
+  tags:
+    - setup-all
+    - setup-nginx-proxy
+
 - import_tasks: "{{ role_path }}/tasks/ssl/main.yml"
   when: run_setup
   tags:
@@ -20,4 +29,10 @@
   become: false
   when: run_self_check
   tags:
-    - self-check
+    - self-check
+
+- name: Mark matrix-nginx-proxy role as executed
+  set_fact:
+    matrix_nginx_proxy_role_executed: true
+  tags:
+   - always

roles/matrix-nginx-proxy/tasks/validate_config.yml

@@ -0,0 +1,12 @@
+---
+
+- 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_nginx_proxy_matrix_client_api_addr_with_proxy_container', 'new': 'matrix_nginx_proxy_proxy_matrix_client_api_addr_with_container'}
+    - {'old': 'matrix_nginx_proxy_matrix_client_api_addr_sans_proxy_container', 'new': 'matrix_nginx_proxy_proxy_matrix_client_api_addr_sans_container'}
+