Add cloudsql container

[jiramot]

About the changes

Create cloudsql container for using cloud proxy in GCP

• Create service account for workload identity

[stale[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[brtkwr]

Would love this feature, what can we do to get this over the line?