Move from circleci to github actions

[lahabana]

What happened?

github actions is free for OSS so we'd save some money.

In the past there were blockers to do this. The ones I remember of were: parallel runs and arm worker. We should first check if we have everything to move to github actions and then maybe do it.

Apparently parallel runs is possible with: https://rubyyagi.com/how-to-run-tests-in-parallel-in-github-actions/