Implement github CI

[caspiano]

Currently, the lack of visible tests on this repo is a bit worrying.

There are numerous examples one can pull from.

A good example is PlaceOS/triggers

• https://github.com/PlaceOS/triggers/blob/master/test
• https://github.com/PlaceOS/triggers/blob/master/Dockerfile.test
• https://github.com/PlaceOS/triggers/blob/master/.github/workflows/ci.yml
• https://github.com/PlaceOS/triggers/blob/master/docker-compose.yml