get https://api.linode.com//databases/postgresql/instances//ssl
Display the SSL CA certificate for an accessible PostgreSQL Managed Database. The database's status needs to be active.
linode-cli databases postgresql-ssl-cert 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>