This is a follow-up issue to https://gitlab.com/gitlab-org/gitlab/-/issues/16525 and https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40137 , in which we add LFS sync support to push mirroring over HTTPS *only*. It would be good to support push mirroring over SSH as well, but to be able to do this, we need to work out how to acquire the necessary metadata and credentials. The `git lfs push` command would make an SSH connection and run a custom command (we support this via gitlab-shell) to do so - is it wise to do the same from within Ruby + Sidekiq?