Automatically integate matrix-media-repo with Valkey (if enabled) (#4851)

* This push request is about handling Traefik ipallowlist to synapse-admin application.

It's my first push request. If I forgot something please let me know. :-)

* Changed position of variable and naming for better expandebility of traefik options

* Remove useless `noqa var-naming` comment and too many blank lines at the end of the file

* If redis ist enabled for matrix media repo it failes to connect to valkey due to inproper configuration.

* Updated solution for fixing MMR redis connection

* Clean up

* Update valkey_container_network condition

---------

Co-authored-by: AkDk7 <joerg@pannbacker.email>
Co-authored-by: Slavi Pantaleev <slavi@devture.com>

group_vars/matrix_servers

@@ -3648,6 +3648,8 @@ matrix_media_repo_container_additional_networks: |
       ([postgres_container_network] if (postgres_enabled and matrix_media_repo_database_hostname == postgres_connection_hostname and postgres_container_network != matrix_media_repo_container_network) else [])
       +
       ([matrix_playbook_reverse_proxyable_services_additional_network] if (matrix_playbook_reverse_proxyable_services_additional_network and matrix_media_repo_container_labels_traefik_enabled) else [])
+      +
+      ([valkey_container_network] if valkey_enabled and matrix_media_repo_redis_enabled else [])
     ) | unique
   }}
 
@@ -3713,6 +3715,21 @@ matrix_media_repo_homeservers_auto:
 
 matrix_media_repo_homeserver_federation_enabled: "{{ matrix_homeserver_federation_enabled }}"
 
+matrix_media_repo_redis_enabled: "{{ valkey_enabled }}"
+
+# Use next redis index since Synapse is on 0. You can chose between index 0 and 15.
+matrix_media_repo_redis_database_number: 1
+
+matrix_media_repo_redis_shards: |
+  {{
+    ([{
+          'name': 'valkey',
+          'addr': (valkey_identifier + valkey_container_http_port | string),
+    }])
+    if valkey_enabled and matrix_media_repo_redis_enabled
+    else []
+  }}
+
 ######################################################################
 #
 # /matrix-media-repo

roles/custom/matrix-media-repo/defaults/main.yml

@@ -895,13 +895,7 @@ matrix_media_repo_redis_database_number: 0
 
 # The Redis shards that should be used by the media repo in the ring. The names of the
 # shards are for your reference and have no bearing on the connection, but must be unique.
-matrix_media_repo_redis_shards:
+matrix_media_repo_redis_shards: []
-  - name: "server1"
-    addr: ":7000"
-  - name: "server2"
-    addr: ":7001"
-  - name: "server3"
-    addr: ":7002"
 
 # Optional sentry (https://sentry.io/) configuration for the media repo