bankstown-lv2: add nix-update-script

pkgs/by-name/ba/bankstown-lv2/package.nix

@@ -3,6 +3,7 @@
   rustPlatform,
   fetchFromGitHub,
   stdenv,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -31,6 +32,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "LIBDIR=lib"
   ];
 
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
   meta = {
     homepage = "https://github.com/chadmed/bankstown";
     description = "Lightweight psychoacoustic bass enhancement plugin";