[libcxx-commits] [libcxx] [llvm] [CI][Github] Add linux premerge workflow (PR #119635)

[Mehdi Amini via libcxx-commits]

https://github.com/joker-eph approved this pull request.

LG, seems like a straightforward translation from the BuildKite flow.
What's the transition plan by the way: are there enough machines provisioned to land this? We'll run the two in parallel until you disconnect the buildkite linux flow right?

https://github.com/llvm/llvm-project/pull/119635