refactor: add nginx to mastodon group in mastodon module

hosts/nachtigall/apps/mastodon.nix

@@ -32,6 +32,9 @@
     owner = config.services.mastodon.user;
   };
 
+  # Nginx user needs access to mastodon unix sockets
+  users.users.nginx.extraGroups = [ "mastodon" ];
+
   services.mastodon = {
     enable = true;
     # Different from WEB_DOMAIN in our case

hosts/nachtigall/apps/nginx.nix

@@ -17,8 +17,6 @@ in {
     };
     recommendedProxySettings = true;
   };
-  # Nginx user needs access to mastodon unix sockets
-  users.users.nginx.extraGroups = [ "mastodon" ];
   
   security.acme = {
     acceptTerms = true;