feature(nix): add wheel and root to the list of trusted users

modules/nixos/settings.nix

@@ -31,6 +31,9 @@
       options = "--delete-older-than 7d";
     };
   };
+  
+  # add trusted users (able to modify the nix store)
+  nix.settings.trusted-users = [ "root" "@wheel" ];
 
   # allow unfree packages (steam, protonvpn, discord, etc.)
   nixpkgs.config.allowUnfree = true;