Identify and address external dependencies in build process
We've seen some issues due to depending on external resources during the build process which has led to errors:
- https://gitlab.com/gitlab-org/distribution/team-tasks/issues/490
- gitlab-org/omnibus-gitlab#2110 (closed)
We should identify where this is, and setup the appropriate replacement in place such that a third party outage does not lead to a failure to release on our part.
The repositories we should focus on are: