nixos/nextcloud: configure redis by default

nixos/doc/manual/release-notes/rl-2511.section.md

···
 
 - `services.dnscrypt-proxy2` gains a `package` option to specify dnscrypt-proxy package to use.
 
+- `services.nextcloud.configureRedis` now defaults to `true` in accordance with upstream recommendations to have caching for file locking. See the [upstream doc](https://docs.nextcloud.com/server/31/admin_manual/configuration_files/files_locking_transactional.html) for further details.
+
 - `services.gitea` supports sending notifications with sendmail again. To do this, activate the parameter `services.gitea.mailerUseSendmail` and configure SMTP server.
 
 - `libvirt` now supports using `nftables` backend.

nixos/modules/services/web-apps/nextcloud.nix

···
 
     configureRedis = lib.mkOption {
       type = lib.types.bool;
-      default = config.services.nextcloud.notify_push.enable;
-      defaultText = lib.literalExpression "config.services.nextcloud.notify_push.enable";
+      default = true;
       description = ''
         Whether to configure Nextcloud to use the recommended Redis settings for small instances.
+
+        ::: {.note}
+        The Nextcloud system check recommends to configure either Redis or Memcache for file lock caching.
+        :::
 
         ::: {.note}
         The `notify_push` app requires Redis to be configured. If this option is turned off, this must be configured manually.

nixos/tests/nextcloud/with-mysql-and-memcached.nix

···
           services.nextcloud = {
             caching = {
               apcu = true;
-              redis = false;
               memcached = true;
             };
             config.dbtype = "mysql";
+            configureRedis = false;
           };
 
           services.memcached.enable = true;