[libcxx-commits] [libcxx] [libcxx] Update testing documentation about CI container images. (PR #149192)

[Louis Dionne via libcxx-commits]

================
@@ -139,6 +139,43 @@ Also note that the Docker container shares the same filesystem as your local mac
 modifying files on your local machine will also modify what the Docker container sees.
 This is useful for editing source files as you're testing your code in the Docker container.
 
+Updating the CI testing container images
----------------
ldionne wrote:

Thanks a lot for the documentation updates! I think this would fit better if integrated into https://github.com/llvm/llvm-project/blob/main/libcxx/docs/Contributing.rst#pre-commit-ci, what do you think?

https://github.com/llvm/llvm-project/pull/149192