[llvm] [Github][Bazel] Add Workflow to Run Bazel Build (PR #165071)

[via llvm-commits]

jaroeichler wrote:

> But regarding runner images we might be able to contribute to this effort sooner. (Jaro, WDYT?)

Yes, will spend some time in the next few days to work on this.


https://github.com/llvm/llvm-project/pull/165071