[U-Boot-Custodians] Enabling GitLab CI builds for your trees

[Tom Rini]

Hey all,

We've now hit the point with GitLab migration where CI support can be
enabled for your trees.  To do this:
1. Head to https://gitlab.denx.de/u-boot/custodians/u-boot-$TREE/edit
and under "Visibility, project features, permissions" and then
"Repository" enable Pipelines.
2. Now you have
https://gitlab.denx.de/u-boot/custodians/u-boot-$TREE/settings/ci_cd as
a valid URL.  Expand the "Runners" section.  You should see under Group
Runners that there's "konsulko-bootbake" listed.  This is a build box
that Konsulko is donating the use of and available to everyone.  It
should get everything built in around 3 hours.

That's it!

That said, there's things that can be done still:
- You have the option of registering your own private runners, with the
  key shown on the settings page.  The way the .gitlab-ci.yml file is
  set currently, if your machine is not faster than a 24 thread
  "Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz" when the big build
  happens, your job may go slower.  It's on my TODO list to split the
  world build up slightly, so that we can get more parallel builds done
  but without the Travis problem of having to keep things to under 50
  minutes.  I think we should have 3 build jobs rather than 52, so that
  particular headache should go away.
- Talk with your organization to see if they're comfortable donating a
  machine to be a GitLab CI runner.  As you might have guessed from the
  CPU specs, the build box Konsulko is donating is not a new high-end
  machine but rather a good refurbished build server.  I think we spent
  around 800 EUR to put this together.  These machines can (and should)
  be well firewalled and only really need to have Docker installed and
  access to the world but not your intranet, etc.
  That is to say, if you can provide a runner for everyone that would be
  amazing, but you should be able to register your own desktop/etc as a
  private runner without issue.

-- 
Tom
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