Concept: Run smoke tests / unit tests in custom built Espruino IDE docker images with GitHub actions

If you let people write JS they'll try to be clever and it'll no longer be a set of 'do this check that' but something far more complicated

I think this speaks most to me personally :D
I will try to keep it as simple as possible and in json. I guess if we need more complexity we could just run/eval a js file as a step from the json test definition.