ci: generate access token from gcr login

Author: Raymond Ottun

.github/workflows/ci.yaml

@@ -108,6 +108,7 @@ jobs:
         name: Authenticate with Google Cloud
         uses: google-github-actions/auth@v1
         with:
+          token_format: access_token
           credentials_json: '${{ secrets.GOOGLE_CREDENTIALS }}'
 
       - name: Login to GCR