settings for workload identity federation (gcs)

try to use a service account

Author: kmizumar

.github/workflows/python-package.yml

@@ -27,6 +27,7 @@ jobs:
       with:
         project_id: 'cluster-storage'
         workload_identity_provider: 'projects/1097862457753/locations/global/workloadIdentityPools/github-actions-pfio-ci-tasks/providers/github'
+        service_account: 'pfio-github-actions'
     - name: 'Set up Google Cloud SDK'
       uses: 'google-github-actions/setup-gcloud@v2'
     - name: 'Check Bucket accessibility'