pipeline: Add android-mainline

[helen-fornazier]

Add definitions of android-mainline from legacy system to the new system.
Add android-mainline tree
Add lab-kontron and lab-pengutronix definitions
Add respective platforms

NOTE: please review this, I didn't test and I wrote based on what I saw from current code and legacy code, so I'm very unsure about this. Please let me know if there is any better way to check/test it.

Reference: #483

[a-wai]

This PR definitely demonstrates how documenting things becomes more and more urgent, as you're basically hitting the "only a few know" barrier, which is definitely on us (full-time contributors) to blame.

There are also stuff in there we never really discussed (like the mach parameter) so expect maybe a few contradictory opinions on that.

Finally, we have an (unwritten, again) rule of listing devices/runtimes/jobs/etc by alphabetical order (even if it's not fully enforced), can you please try to follow that principle in the future?

[pawiecz]

Let's reduce the scope of this PR to include only: tree definition, build_configs adjustments and setting up kbuild_* jobs (moving baseline_* ones to a separate PR - together with labs and platforms definitions).

[helen-fornazier]

@a-wai @pawiecz PR updated (except for the PR separation, please check my questions), please review it when you have some time (and thanks a lot for the review)

[a-wai]

Only a small change left which I didn't spot before, otherwise should be good to go :)

After it's done feel free to drop the staging-skip label and undraft this PR

[helen-fornazier]

Only a small change left which I didn't spot before, otherwise should be good to go :)

After it's done feel free to drop the staging-skip label and undraft this PR

looks like I don't have permissions to drop labels

[a-wai]

LGTM, thanks!

[a-wai]

Looks like I spoke too soon ;) Can you please add entries to the scheduler: section, so the builds are actually executed? (those should be quite straightforward)

[helen-fornazier]

Looks like I spoke too soon ;) Can you please add entries to the scheduler: section, so the builds are actually executed? (those should be quite straightforward)

should I just add the following? Or is there anything else?

  - job: kbuild-gcc-10-armel-android-mainline
    <<: *build-k8s-all
    
  - job: kbuild-gcc-10-armel-android-mainline-imx
    <<: *build-k8s-all

Do I need to add rules for selecting tree and branch?

[helen-fornazier]

@a-wai I added a new commit to this PR adding entries to scheduler:, please check

[nuclearcat]

I think we got it tested: https://staging.kernelci.org:9000/dashboard?treetests=a5ed8b92e9f630bbe7309421a8c61f38d2889b82

[a-wai]

Indeed, I'm happily hitting that "Merge" button then :)