Fix Docker authentication for Python ValidatesContainer Dataflow With RC tests (#36718)

* Added Docker authentication

* removed the Docker auth step from the workflow

Author: aIbrahiim

.github/workflows/beam_PostCommit_Python_ValidatesContainer_Dataflow_With_RC.yml

@@ -81,6 +81,13 @@ jobs:
         with:
           java-version: default
           python-version: ${{ matrix.python_version }}
+      - name: Authenticate to GCP
+        uses: google-github-actions/auth@v3
+        with:
+          service_account: ${{ secrets.GCP_SA_EMAIL }}
+          credentials_json: ${{ secrets.GCP_SA_KEY }}
+      - name: Set up Cloud SDK
+        uses: google-github-actions/setup-gcloud@v3
       - name: Set PY_VER_CLEAN
         id: set_py_ver_clean
         run: |

sdks/python/container/run_validatescontainer.sh

@@ -134,6 +134,11 @@ echo ">>> Successfully built and push container $CONTAINER"
 cd sdks/python
 SDK_LOCATION=$2
 
+echo ">>> Configuring Docker authentication for GCR"
+gcloud --quiet auth configure-docker us.gcr.io
+gcloud --quiet auth configure-docker gcr.io
+gcloud auth print-access-token | docker login -u oauth2accesstoken --password-stdin https://us.gcr.io
+
 echo ">>> RUNNING DATAFLOW RUNNER VALIDATESCONTAINER TEST"
 pytest -o log_cli=True -o log_level=Info -o junit_suite_name=$IMAGE_NAME \
   -m=it_validatescontainer \