DRM CI

[Maxime Ripard]

Hi,

At last Plumbers, we agreed with Dave that a good first step to ramp up
CI for DRM trees would be to enable build and kunit testing in the main
DRM tree.

I played around with it last week and wrote a good first iteration of
the gitlab-ci file.

https://gitlab.freedesktop.org/mripard/gitlab/-/blob/main/.gitlab-ci.yml?ref_type=heads

It will compile all drm-misc defconfigs, for arm, arm64 and x86
architectures, and will run kunit for those as well. Now that the gitlab
migration is mostly over, I guess we could start using it after the
merge window if everyone agrees.

It's also easily shareable with drm-misc, if we ever want to use it
there.

I guess it's useful on its own, but I've started to look into making dim
create PR for drm automatically.

Gitlab support push options to create a PR automatically when pushing:
https://docs.gitlab.co.jp/ee/user/project/push_options.html#push-options-for-merge-requests

Unfortunately, it seems to work only for branches, not tags. I guess we
could put the PR description we put in the tag at the moment in the PR
description, but I'm not sure if it's a big deal or not.

Maxime
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