wheelwizard: add update script

pkgs/by-name/wh/wheelwizard/package.nix

@@ -7,8 +7,10 @@
   makeDesktopItem,
   makeWrapper,
   avalonia,
-  #Runtime dependencies
+  # Runtime dependencies
   libglvnd,
+  # passthru
+  nix-update-script,
 }:
 buildDotnetModule rec {
   pname = "wheelwizard";
@@ -70,6 +72,8 @@ buildDotnetModule rec {
     categories = [ "Game" ];
   };
 
+  passthru.updateScript = nix-update-script { };
+
   meta = with lib; {
     description = "WheelWizard, Retro Rewind Launcher";
     homepage = "https://github.com/TeamWheelWizard/WheelWizard";