Run rebase on Cygwin CI

[DWesl]

Attempt to close #20221 by rebasing NumPy dlls to avoid fork() failures.

[DWesl]

Is there a way to tell the CI that these three files primarily affect the "Test on Cygwin / cygwin_build_test" run so it doesn't need to bother running most of the tests?

[mattip]

Rather than run the whole test suite, you can add specific tests via the -t argument to runtests.py, or add pytest-specific arguments after -- so something like runtest.py ... -- <pytest stuff here>

numpy/.github/workflows/cygwin.yml

Line 54 in d5f6618

dash -c "/usr/bin/python3.8 runtests.py -n -vv"

[DWesl]

Rather than run the whole test suite, you can add specific tests via the -t argument to runtests.py, or add pytest-specific arguments after -- so something like runtest.py ... -- <pytest stuff here>

numpy/.github/workflows/cygwin.yml

Line 54 in d5f6618

dash -c "/usr/bin/python3.8 runtests.py -n -vv"

I was thinking more along the lines of not running the Windows, Linux, or Mac tests on a PR that only touches the Cygwin test driver and three helper scripts only used on Cygwin, since the changes should only affect the Cygwin tests and a few of the linters.

If I get a good description of which files impact which parts of the test suite, I'll try to put that in a format other CI jobs can use.

[charris]

Thanks @DWesl .