Require tests passing before merge once flaky tests go away

[decentral1se]

Once #237 lands, we can guard the test suite with something like:

https://github.com/planetary-social/scuttlego/blob/main/Makefile

https://github.com/planetary-social/scuttlego/blob/main/.github/workflows/ci.yml

@boreq CI magic

[KyleMaas]

We're getting closer...