"I'm a teapot" is not a very good error for failing http pushes
Because it came up on IRC again:
From what I know push via https was blocked some months ago, and pushing currently leads to
fatal: unable to access 'https://gitlab.gnome.org/creiter/myrepo.git/': The requested URL returned error: 418
I don't know if this can be changed, but it's hard to know from that error alone what is the real problem and that ssh should be used instead.