Merge pull request #4623 from blackpiglet/push-image-in-github-workflow

Add pushing image to GCR in github workflow

.github/workflows/push.yml

@@ -55,3 +55,16 @@ jobs:
       run: |
         docker login -u ${{ secrets.DOCKER_USER }} -p ${{ secrets.DOCKER_PASSWORD }}
         ./hack/docker-push.sh
+
+    # Use the JSON key in secret to login gcr.io
+    - uses: 'docker/login-action@v1'
+      with:
+        registry: 'gcr.io' # or REGION.docker.pkg.dev
+        username: '_json_key'
+        password: '${{ secrets.GCR_SA_KEY }}'
+
+    # Push image to GCR to facilitate some environments that have rate limitation to docker hub, e.g. vSphere.
+    - name: Publish container image to GCR
+      if: github.repository == 'vmware-tanzu/velero'
+      run: |
+        REGISTRY=gcr.io/velero-gcp ./hack/docker-push.sh