level-zero: add setup-hook for Intel OpenGL driver lookups

The Level Zero package requires /run/opengl-driver/lib and
/run/opengl-driver-32/lib
to be in LD_LIBRARY_PATH for the Intel GPU driver to function correctly.

This change adds a setup-hook that prepends these paths if they exist,
ensuring runtime linker can find the necessary driver libraries in
NixOS and other Linux systems without manual environment modifications.

pkgs/by-name/le/level-zero/package.nix

@@ -29,6 +29,8 @@ stdenv.mkDerivation rec {
     addDriverRunpath $out/lib/libze_loader.so
   '';
 
+  setupHook = ./setup-hook.sh;
+
   passthru = {
     tests = {
       inherit intel-compute-runtime openvino;

pkgs/by-name/le/level-zero/setup-hook.sh

@@ -0,0 +1,7 @@
+if [ -d /run/opengl-driver/lib ]; then
+  export LD_LIBRARY_PATH="/run/opengl-driver/lib${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH:-}"
+fi
+
+if [ -d /run/opengl-driver-32/lib ]; then
+  export LD_LIBRARY_PATH="/run/opengl-driver-32/lib${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH:-}"
+fi