Provision a Container Registry database for Omnibus installations

Context

As part of #1071 (closed) we will need to to provision a new logical database for the container registry when the metadata has been enabled.

Alternatively, a new database instance could also be provisioned.

Problem

There is no previous precedent from other services using its own database. We will need to find a way to:

• Provision a database instance
• Create a backup mechanism
• Other unknowns