Package server that can serve Maven and Debian packages
See https://gitlab.com/gitlab-org/gitlab-ce/issues/19095 for the background.
Moving here since it will be EE only.
The idea is to remove the need to use Nexus or Artifactory. Since we'll not have all the formats of artifactory from day one we'll also support Artifactory better https://gitlab.com/gitlab-org/gitlab-ce/issues/18128
The first iteration of the Debian code is in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2234