GNU/Hurd support for testing on CI systems

[Guillem Jover]

Hi!

I recently found about https://vmactions.org/, which makes it possible
to add GitHub CI jobs for multiple operating systems besides the stock
ones provided there.

After having added that for dpkg for several of those OSes, I then
failed to test the last release on GNU/Hurd, perhaps relying on those
checks (although I've had a local VM for a very long time).

I was thinking that it would be a really nice project if someone could
add support for GNU/Hurd to several of this kind of projects, so that
upstreams or packagers can then test for buildability or regressions on
GNU/Hurd. I guess a partial list of places that would be nice to extend
could be:

  GitHub: https://github.com/vmactions
  FreeDesktop: https://gitlab.freedesktop.org/freedesktop/ci-templates
  Salsa: https://salsa.debian.org/salsa-ci-team/pipeline

I'm not aware of anything similar for Codeberg or GitLab in general.

Thanks,
Guillem