[llvm] [GitHub][CI] Factor out duplicate container building code into composite actions (PR #166663)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. Thanks for putting this together. This is something I've been wanting to do for a while, especially since we've essentially duplicated the workflow even more times for some containers that we ship inside llvm-zorg.

https://github.com/llvm/llvm-project/pull/166663