pulumi: fix withPackages invocation (#331660)

Re-add PATH handling, which was removed without explanation.
Also add an end quote to the LD_LIBRARY_PATH line.

Co-authored-by: Cameron Nemo <cam@libnemo.org>

pkgs/tools/admin/pulumi/default.nix

@@ -131,7 +131,8 @@ buildGoModule rec {
       ''
         mkdir -p $out/bin
         makeWrapper ${pulumi}/bin/pulumi $out/bin/pulumi \
-          --set LD_LIBRARY_PATH "${stdenv.cc.cc.lib}/lib
+          --suffix PATH : ${lib.makeBinPath (f pulumiPackages)} \
+          --set LD_LIBRARY_PATH "${stdenv.cc.cc.lib}/lib"
       '';
   };