bundlerUpdateScript: init and use (#64822)

pkgs/tools/misc/fluentd/default.nix

@@ -1,4 +1,4 @@
-{ lib, bundlerEnv, ruby }:
+{ lib, bundlerEnv, ruby, bundlerUpdateScript }:
 
 bundlerEnv {
   inherit ruby;
@@ -6,11 +6,13 @@ bundlerEnv {
   pname = "fluentd";
   gemdir = ./.;
 
+  passthru.updateScript = bundlerUpdateScript "fluentd";
+
   meta = with lib; {
     description = "A data collector";
     homepage    = https://www.fluentd.org/;
     license     = licenses.asl20;
-    maintainers = with maintainers; [ offline ];
+    maintainers = with maintainers; [ offline nicknovitski ];
     platforms   = platforms.unix;
   };
 }