Bors-NG -- a GitHub app that keeps the master branch forever passing all the tests.
If you just want to set it up on your own repository, there's the getting started walkthrough that hundreds of users have gone through to set up the public instance. Bors has private instances run by major projects like RubyGems Bundler, Microsoft OpenEnclave, and CockroachDB.
Interested in Elixir? Like working on development tooling, GitHub's REST API, and projects with lots of stakeholders with subtly different wants? There's E-Easy issues in GitHub and not-so-easy issues if you want to stretch your debugging muscles.
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