allow package write permission to push helm oci artifacts

Signed-off-by: Rahul Sharma <rahulsharm@nvidia.com>

Author: rahulait

.github/workflows/forward-compatibility.yaml

@@ -72,6 +72,7 @@ jobs:
     permissions:
       contents: read
       id-token: write
+      packages: write
     uses: ./.github/workflows/e2e-tests.yaml
     with:
       operator_image: ghcr.io/nvidia/gpu-operator