[vim/vim] CI: no runner for Cygwin (PR #20970)

Vim can be built for Cygwin with the Unix Makefile, but nothing covers it. The Windows runner builds with MSVC and MinGW only, and the Cirrus CI job that was removed in 0abffbff ran FreeBSD alone.

Add a GitHub Actions workflow that configures and builds under Cygwin.  It runs once per day instead of per push, and skips the run when nothing was committed since the previous one, because the Cygwin runner is slow.  Only the tiny test suite, the unit tests and the libvterm tests are run: the script tests need sockets, PowerShell, network access and POSIX file permissions, which do not behave the same under Cygwin.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20970

-- Commit Summary --

  * CI: no runner for Cygwin

-- File Changes --

    A .github/workflows/ci-cygwin.yml (118)
    M Filelist (1)

-- Patch Links --

https://github.com/vim/vim/pull/20970.patch
https://github.com/vim/vim/pull/20970.diff

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