http://nkuz2tpok7ctwd5ueer5bytj3bm42vp7lgjcsnznal3stotg6vyaakyd.onion/rbm-tar.html
Possible values: xz, gz, bz2. commit_gpg_id If set, the commit selected with git_hash will have its
signature checked. The tarball will not be created if there is
no valid signature, and if the key used to sign it does not
match the key ID from commit_gpg_id .