Deploy and migrate the new container registry for GitLab.com (Phase 1)
## Context
This is part of the work to upgrade and migrate the GitLab.com container registry to a new version backed by a metadata database and online garbage collection (https://gitlab.com/groups/gitlab-org/-/epics/5523). This will be achieved following the gradual migration plan detailed in https://gitlab.com/gitlab-org/container-registry/-/issues/374.
This specific epic is meant to collect the tasks required for [Phase 1](https://gitlab.com/gitlab-org/container-registry/-/issues/374#phase-1-the-metadata-db-serves-new-repositories) of the migration plan.
## Status
2022-01-19
https://gitlab.com/gitlab-org/gitlab/-/issues/336875 was completed today and as such Phase 1 is now complete.
epic