Federated git

Related:

  - https://gitlab.com/gitlab-org/gitlab-ee/issues/4517
  - https://gitlab.com/gitlab-org/gitlab-ce/issues/44486
  - https://github.com/gogs/gogs/issues/4437
  - https://github.com/go-gitea/gitea/issues/184
  - https://github.com/go-gitea/gitea/issues/1612

I can only imagine how great it would be to have all these forge federated not only with each other, but with the whole ActivityPub network (Mastodon & co.) as well…