run tests on all commits for main

[facchettos]

What issue type does this pull request address? (keep at least one, remove the others) /kind enhancement

What does this pull request do? Which issues does it resolve? (use resolves #<issue_number> if possible) resolves #

Please provide a short message that should be published in the vcluster release notes Fixed an issue where vcluster ...

What else do we need to know?

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[FabianKramm]

@facchettos why do we need this?

[facchettos]

@FabianKramm because we don't use either a merge queue or ensure that the pr branch is up to date with main, so there is some possibility that main breaks because of changes that don't conflict in git but do in the logic

[FabianKramm]

Then we should enforce that the PR branch is up to date with main, because nobody is looking at the tests after merge and they just count towards our minute limit

[facchettos]

enforcing the pr's head to be up to date will actually be more expensive than running the tests on main, because all PRs will need a new ci run after each merge to main before they can be merged