trinity: add passthru.updateScript

pkgs/by-name/tr/trinity/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  unstableGitUpdater,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -24,6 +25,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   installFlags = [ "DESTDIR=$(out)" ];
 
+  passthru.updateScript = unstableGitUpdater { tagPrefix = "v"; };
+
   meta = {
     description = "Linux System call fuzz tester";
     mainProgram = "trinity";