Merge pull request #304 from NVIDIA/rhel9-ghcr

build pre-release ghcr.io images for rhel9

Author: tariq1890

.github/workflows/image.yaml

@@ -42,6 +42,7 @@ jobs:
           - ubuntu22.04
           - ubuntu24.04
           - rhel8
+          - rhel9
         ispr:
           - ${{github.event_name == 'pull_request'}}
         exclude: