[build-ml-whl] Improve safety and logging

[dbarbuzzi]

Summary:

Improve general scripting safety and logging of build-ml-whl.

Details:

Recently, the build job started failing: https://github.com/neuralmagic/llm-compressor-testing/actions/runs/16765257143/job/47524176286

/home/runner/_work/_temp/50ab11ad-06e5-463a-aca3-98222a2695e3.sh: line 17: cd: too many arguments

With the logging added in this branch’s initial commit, it was learned that this was due to the project adding another Makefile in a subdirectory, thus confusing the results which only ever expected to find a single Makefile:

makefile_path=./llm-compressor/Makefile
./llm-compressor/docs/Makefile
makefile_dir=./llm-compressor/Makefile
./llm-compressor/docs
/home/runner/_work/_temp/61bfa8a4-a12b-4e4d-8f2d-95bfd16d2ea0.sh: line 24: cd: $'./llm-compressor/Makefile\n./llm-compressor/docs': No such file or directory

The newly added -maxdepth 2 flag for this command limits the depths that it will search for the Makefile in a way that is compatible with our existing projects/usages and reduces the chances this particular issue will occur again. A further future-proofing would be to replace the find usage with an input specifying the dir to run the make command, or at least have it optional so the find command is a fallback if not specified.

Test Plan:

• https://github.com/neuralmagic/llm-compressor-testing/actions/runs/16782152450

[dhuangnm]

Thanks for fixing it!