nextcloud: Configure redis caching

configuration/services/nextcloud.nix

@@ -4,7 +4,7 @@
   options,
   ...
 }: let
-  nextcloud = pkgs.nextcloud26;
+  nextcloud = pkgs.nextcloud27;
   hostName = "nextcloud.${config.services.nginx.domain}";
 in {
   services.nextcloud = {
@@ -16,6 +16,8 @@ in {
     maxUploadSize = "2G";
     https = true;
 
+    configureRedis = true;
+
     config = {
       overwriteProtocol = "https";
 
@@ -37,12 +39,10 @@ in {
     extraApps = {
       inherit (pkgs.local) bookmarks calendar contacts cookbook news notes;
     };
-
-    # TODO(tlater): Add redis config. This will be much easier
-    # starting with 22.11, since this will add an `extraOptions` where
-    # the necessary redis config can go.
   };
 
+  services.redis.vmOverCommit = true;
+
   # Ensure that this service doesn't start before postgres is ready
   systemd.services.nextcloud-setup.after = ["postgresql.service"];