🇩🇪 Add support for Hetzner cloud

[major]

CoreOS works well on Hetzner's cloud instances with embedded ignition
configurations in /boot/ignition/config.ign. Add support for ignition
to pull userdata configurations from Hetzner's metadata service.

Signed-off-by: Major Hayden major@redhat.com

[cgwalters]

I swear there was some sort of previous PR/discussion with a team from Hetzner about this but I can't find it right now. It may be that previously they had a custom metadata system, but this looks very "AWS/OpenStack/etc." esque?

[major]

I swear there was some sort of previous PR/discussion with a team from Hetzner about this but I can't find it right now. It may be that previously they had a custom metadata system, but this looks very "AWS/OpenStack/etc." esque?

I think this has evolved a bit over time, but it now looks a lot more standardized. cloud-init seems to work quite well with it. I have not yet tested my change there, but I figured I would open a PR just in case someone had reasons for/against adding the Hetzner support.

[travier]

Thanks for working on that. As Ignition is only one of the pieces required for platform support, could you file a new platform request with as much info as possible so that we can track that properly? Thanks!

[major]

@travier Can do!

[bgilbert]

Previous discussion in #667 and coreos/afterburn#125.

[ibotty]

Any updates? This would be great to have.

[major]

I've gotten sidetracked onto a bunch of other projects and haven't had time to come back to this. 😢

[tracure1337]

New here but looking forward to this! Thanks in advance :-)

[nightspotlight]

I'm also looking forward to this

[travier]

Thanks for opening this PR. This should be fixed with #1707. Feel free to re-open if something is missing. Thanks!