hardcode GCP version

.github/workflows/main.yml

@@ -14,6 +14,7 @@ jobs:
 
       - name: Setup gcloud authentication
         uses: GoogleCloudPlatform/github-actions/setup-gcloud@master
+        version: '300.0.0'
         with:
           service_account_key: ${{ secrets.GCS }}
 
@@ -30,9 +31,6 @@ jobs:
       - name: Copy ci files to root
         run: cp ci-tools/repos/${{ github.event.repository.name }}/* .
 
-      - name: Define CLOUDSDK_PYTHON environment variable
-        run: export CLOUDSDK_PYTHON=/usr/bin/python
-
       - name: Start docker-compose services
         run: docker-compose -f docker-compose.yaml up -d