flood-for-transmission: set passthru.updateScript

pkgs/by-name/fl/flood-for-transmission/package.nix

@@ -3,6 +3,7 @@
   lib,
   buildNpmPackage,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 buildNpmPackage (finalAttrs: {
@@ -28,6 +29,8 @@ buildNpmPackage (finalAttrs: {
     runHook postInstall
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Flood clone for Transmission";
     homepage = "https://github.com/johman10/flood-for-transmission";