Migrate to GitHub Actions for CI testing.

[marrow]

Migrate to GitHub Actions for CI testing.

[njsmith]

For the record, I'm using nightly builds there because that project relies heavily on 3.5 features, and pypy's 3.5 support was still unreleased when I started, & is still in beta and under heavy development. It works pretty good but if I were targeting pypy2 then I'd probably use the latest release build from squeaky (as recommended by the official download page). Should pretty much just be a matter of changing the download URL.

I'm going to unsubscribe from this issue, so @ mention me if you want me to see replies. HTH, GL

[amcgregor]

Original IRC log: https://gist.github.com/amcgregor/69dc6d5d8169dd2fc9a89c5324a4a396

And an accidental close; wewt! Caffeine, how does it work?

[amcgregor]

Scratch that, new plan is to drop Travis-CI in favour of GitHub Actions. This likely will not result in the same level of coverage in terms of the build matrix (versions and combinations of installed features v. multiple MongoDB versions) but I'll see what I can pull off.