Running GitHub on Rails 6.0. Back in 2019 Eileen M. Uchitelle explained how GitHub upgraded everything in production to Rails 6.0 within 1.5 weeks of the stable release. There’s a trick in here I really like: they have an automated weekly job which fetches the latest Rails main branch and runs the full GitHub test suite against it, giving them super-early warnings about anything that might break and letting them provide feedback to upstream about unintended regressions.
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