Move from Travis to GitHub Actions

[holgerd77]

There was the suggestion by @ryanio in this comment to move the CI to GitHub Actions, being currently run on Travis, this was perceived positive by @cgewecke.

I would tend to give this some stronger priority cause I think workflow of bringing PRs up-to-date and have the checks pass to be mergeable would profit a lot by CI being faster and better integrated. Currently it is somewhat arduous to wait for PR updates to re-finish with the CI run.

@ryanio Can you take on this? Respectively other voices on this here?

References:

• .travis.yml

[holgerd77]

Ah, just remember, there was this eventual limitation to Action runs on the ethereum GitHub organization (can't find the reference atm). Any new information on this?

[holgerd77]

Update: @ryanio if you want you can nevertheless do a draft PR on this just to see and get a feel how things behave.

[nivida]

@holgerd77 This issue can probably get closed: #3034

[ryanio]

I started work on this here: ryanio#1. Feel free to give it a preliminary look.