passff-host: add nix-update-script

pkgs/by-name/pa/passff-host/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromCodeberg,
+  nix-update-script,
   python3,
   pass,
 }:
@@ -45,6 +46,8 @@ stdenv.mkDerivation (finalAttrs: {
     done
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Host app for the WebExtension PassFF";
     homepage = "https://codeberg.org/PassFF/passff-host";