Fix gating.yaml push to quay.io

Adding registry as it is required based on the documentation:
https://github.com/marketplace/actions/push-to-registry

.github/workflows/gating.yaml

@@ -69,6 +69,7 @@ jobs:
         with:
           image: ${{ steps.build-image.outputs.image }}
           tags: ${{ steps.build-image.outputs.tags }}
+          registry: ${{ env.IMAGE_REGISTRY_QUAY }}
 
       - name: Print image url if PR is not from fork
         if: |