Explicitly support object storage bucket prefixes
When we removed background upload support in 15.0 &733 we later found out that some administrators had been using object storage bucket names with a slash (/) in them to avoid having to create a dozen different object storage buckets for GitLab. They would use bucket names like my-gitlab-bucket/artifacts, my-gitlab-bucket/lfs, my-gitlab-bucket/uploads etc. Apparently this worked with background upload, but not with (all mechanisms for?) direct upload.
I think we should add explicit support for this because:
- It fixes the issues users of the unofficial feature are having since 15.0
- It is a natural, unsurprising way to not have to create many buckets
- Once fixed, this makes life easier for all new GitLab installations because we can instruct people to set up and use only 1 bucket
Related issues: