niri: add updateScript

pkgs/by-name/ni/niri/package.nix

@@ -1,6 +1,7 @@
 { lib
 , rustPlatform
 , fetchFromGitHub
+, nix-update-script
 , pkg-config
 , libxkbcommon
 , pango
@@ -76,6 +77,8 @@ rustPlatform.buildRustPackage rec {
     install -Dm0644 resources/niri{-shutdown.target,.service} -t $out/share/systemd/user
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = with lib; {
     description = "Scrollable-tiling Wayland compositor";
     homepage = "https://github.com/YaLTeR/niri";