Log in to GCR

.github/workflows/docker.yml

@@ -29,6 +29,13 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Login to GCR
+        uses: docker/login-action@v1
+        with:
+          registry: gcr.io
+          username: _json_key
+          password: ${{ secrets.GCP_CREDS }}
       -
         name: Checkout TensorFlow to get the current version
         uses: actions/checkout@v2