get https://api.linode.com//databases/postgresql/instances//credentials
Display the root username and password for an accessible PostgreSQL Managed Database. The database's status needs to be active.
linode-cli databases postgresql-creds-view 123
<https://techdocs.akamai.com/cloud-computing/docs/getting-started-with-the-linode-cli>
databases:read_only
<https://techdocs.akamai.com/linode-api/reference/get-started#oauth>