Fixes #37453 - Support Zeitwerk loader

[ofedoren]

~WIP~

requires https://github.com/theforeman/foreman-tasks/pull/752

[ekohl]

requires theforeman/foreman-tasks#752

We support gemfile.d where you can add the foreman-tasks dependency with your branch: https://github.com/theforeman/actions/blob/61c576caf6aea7bf18178a2bac7b21178fb44ed9/.github/workflows/foreman_plugin.yml#L121-L123

[ofedoren]

Something is unhappy:

NoMethodError: undefined method `config' for nil:NilClass
    test/test_helper.rb:181:in `setup_set_script_name'
    test/test_helper.rb:84:in `before_setup'

https://github.com/theforeman/foreman/blob/9fccd97887938c718cda9f638ed8e049091852b3/test/test_helper.rb#L180-L182

Looks like some test doesn't set @controller, which is weird because this isn't changing any of that and we haven't changed it in Foreman itself either.

It was a silly mistake in test/functional/ui_job_wizard_controller_test.rb. The test case's class name should comply with the actual controller (Ui -> UI).

[ekohl]

@evgeni this failed to build and has already been rotated, but I'm assumed it failed to build because it needs a patched Foreman and/or foreman-tasks. I recall you did something similar with a lookaside repo. Do you recall how?

[evgeni]

If the only thing you need is a build against a Zeitwerk-enabled Foreman: Add the packit for https://github.com/theforeman/foreman/pull/10131 to external_repos of packit and run with it. If you want it more stable, mirror those builds to an external URL so they remain even if Copr cleans them up.

[ekohl]

Ah yes. Looks like I'll manually compose a repository with all packages. Then it's also an easy place to test everything.

[evgeni]

That's what I did for webpack5, and it was quite fine to test with

[ofedoren]

Ready to merge after https://github.com/theforeman/foreman/pull/10131 is merged, dropped the commit for testing with Foreman PR, the latest run was green:

[adamruzicka]

Thank you @ofedoren !