tests: add GitHub Actions CI

[bnb]

PR to attempt adding GitHub Actions CI as a parallel to/eventual (?) replacement for TravisCI.

Varied a bit from the setups I've done so far, so I don't fully expect this to work on the first run. That said, I'll be working to get it passing.

Few things to note:

• There's not currently (AFAIK) a Sauce Labs Action that parallels what TravisCI currently does. I reached out on Twitter to ask if something existed or was planned, and @christian-bromann started working on an Action. Ideally we'd be able to use that once it's done ❤️
• The configuration to parallel CMD=test and CMD=test-browser is relatively straightforward and documented here, but omitted from this PR since the PR does not currently include Sauce Labs.
• I opted to run on all platforms since that's a personal preference of mine, but if there are platforms you'd prefer to be removed I'm happy to do so.

[bnb]

Hmm, theoretically the Checks should have run, though I could (?) be wrong about that. Double checking in a dummy repo.

[vweevers]

What's the motivation for replacing Travis?

[bnb]

Per my understanding from a Build WG member when I asked about GitHub CI, it was agreed to attempt using GitHub CI in a few repos in the org that already use TravisCI. If it works as a reasonable replacement, it could eventually become that but for now perhaps not the goal we'd be going for.

[bnb]

Looking into how I can trigger this correctly. Will update as appropriate ❤️

[bnb]

Ah, it looks like they're running on my repo, it's just not being surfaced here! Excellent.

There's a failure with tap not being available, I'm realizing that's likely caused because I removed npm install. Will address and progress can be followed there ❤️

[bnb]

Passed!

It's worth noting that this GitHub Actions CI build was triggered 6 minutes ago (from time of comment) and already completed on all operating systems on all versions, while TravisCI is waiting to be queued 😬

Edit: Link to passed run

[bnb]

Also, I noticed that the Travis run only tests Linux. I'd be happy to remove macos-latst and windows-latest if that'd be the preferred path of the maintainers.

[mcollina]

LGTM

[mcollina]

Good work! Are tests passing already on Windows?

[bnb]

Are tests passing already on Windows?

Seems like it 👍

[vweevers]

LGTM. Regarding Sauce Labs, I can open a PR to create a separate workflow with an upgraded airtap (which now supports GH Actions).

[christian-bromann]

• There's not currently (AFAIK) a Sauce Labs Action that parallels what TravisCI currently does. I reached out on Twitter to ask if something existed or was planned, and @christian-bromann started working on an Action. Ideally we'd be able to use that once it's done

The GitHub action is done: https://github.com/saucelabs/sauce-connect-action

[vweevers]

@christian-bromann Nice, thanks! Though we no longer need it here.