CI: Add Cygwin CI.#1

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DWesl wants to merge 19 commits intomainfrom

Commits on May 25, 2022

Commits on May 26, 2022

Commits on May 29, 2022

Merge branch 'scipy:main' into patch-1
DWesl
authored

Commits on Jun 7, 2022

Merge branch 'scipy:main' into patch-1
DWesl
authored

Commits on Jun 8, 2022

Commits on Jun 10, 2022

CI: Check pip editable install on SciPy main.
DWesl
authored