Gonna revert and modify the original flake, add back overlays from a shared file, and figure things out after

modules/system/accounts/groups/nfsShare/default.nix

@@ -1,4 +1,6 @@
 { ... }:
 {
-  users.groups.nfsShare = {};
+  users.groups.nfsShare = {
+    gid = 983;
+  };
 }

modules/system/accounts/users/liquidsoap/default.nix

@@ -4,6 +4,7 @@
     nextcloud = {
       extraGroups = [ "nginx" ];
       isSystemUser = true;
+      uid = 155;
     };
   };
 }

modules/system/accounts/users/nextcloud/default.nix

@@ -3,6 +3,7 @@
     nextcloud = {
       extraGroups = [ "nfsShare" ];
       isSystemUser = true;
+      uid = 995;
     };
   };
 }

modules/system/accounts/users/nginx/default.nix

@@ -4,6 +4,7 @@
     nginx = {
       extraGroups = [ "turnserver" "virtualMail" ];
       isSystemUser = true;
+      uid = 60;
     };
   };
 }