nixos/users: set password for root

nixos/users.nix

@@ -45,6 +45,7 @@ let
     };
   };
 in
+lib.recursiveUpdate
   (builtins.foldl'
     (attrs: user: {
       options = lib.recursiveUpdate attrs.options (mkUser user.name attrs.uid (user.options or { }));
@@ -56,3 +57,6 @@ in
     }
     users
   ).options
+  {
+    users.users.root.initialPassword = "tuxcord";
+  }