Use GitHub Actions for CI

[orien]

Context

travis-ci.org is dead and the current CI pipeline is not working.

Change

To ensure compatibility and quality, I propose using GitHub Actions for CI. The proposed workflow is passing on my fork, and will be added to this repo with the merge of this pull request.

[orien]

@pda and/or @Kache what do you think of this proposal?

[orien]

🍃