Switch from Travis CI to GitHub Actions

[aays]

I recently learned that Travis CI is apparently no longer free and will actually be migrating from travis-ci.org soon. Apparently all projects were also locked and made read-only on Dec 31, 2020. Yikes.

Apparently GitHub Actions is a viable and free alternative we should consider switching to if future iterations of the course make use of the repo once more.

A useful reference if we're to do that: geerlingguy/ansible-role-apache#201

[James-S-Santangelo]

Damn, I think I had heard about some stuff going on over at Travis-CI but didn't realize it was this crazy. I'm happy to help migrate over to GitHub Actions. From the link it doesn't look too bad but it'll probably take a bit of tweaking.

[QuLogic]

It's not too bad; you can use one of usethis::use_github_action* to prepare a mostly-working setup.