[llvm] [workflows] Add post-commit job that periodically runs the clang static analyzer (PR #94106)

[Artem Dergachev via llvm-commits]

https://github.com/haoNoQ commented:

I'm very excited to see this!

A few years ago we've actually had some work done to improve quality on LLVM specifically, and even built an LLVM-specific checker (it finds `dyn_cast`s that aren't checked for null before use): https://discourse.llvm.org/t/gsoc-2019-apply-the-clang-static-analyzer-to-llvm-based-projects-final-report/52919/4

cc @Xazax-hun @RKSimon @sylvestre @csaba-dabis 

IIRC it was Sylvestre who was maintaining the old scan-build output bot, and Simon has been voluntarily fixing these warnings for a while.

https://github.com/llvm/llvm-project/pull/94106