feat(x1): add 'tss' group to user extraGroups

- Included `tss` group in `user.extraGroups` to grant necessary permissions.
- Ensures proper functionality and aligns with updated requirements.

systems/x86_64-linux/x1/default.nix

@@ -63,6 +63,7 @@ with lib.metacfg;
     user.extraGroups = [
       "docker"
       "dialout"
+      "tss"
     ];
   };