equicord: add passthru.updateScript

pkgs/by-name/eq/equicord/package.nix

@@ -5,6 +5,7 @@
   nodejs,
   pnpm_9,
   stdenv,
+  nix-update-script,
   buildWebExtension ? false,
 }:
 stdenv.mkDerivation (finalAttrs: {
@@ -51,6 +52,8 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "The other cutest Discord client mod";
     homepage = "https://github.com/Equicord/Equicord";