Create a Default Database for the Container Registry

Summary

We should instantiate a default database for the container registry and preconfigure the container registry to connect to this database.

See: Include a Default Database for the Container Re... (gitlab-org/gitlab#480742 - closed) • Hayley Swimelar • 17.8 • At risk specifically, and Release container registry with metadata databa... (gitlab-org&5521) • Jaime Martinez, Hayley Swimelar+ • On track generally

The container registry team is planning on moving to enabling the metadata database by default for %19.0, but the database connection info can still be preconfigured as long as the database is disabled. Therefore, most of these changes may be completed before the %19.0 milestone.

Impact

Enable database integration for the container registry by creating a preconfigured database environment that can be automatically enabled in future releases.