[nlunbeck]

> Because ephemeral environments are reproducible on demand (via Docker images, Kubernetes pods, or a cloud VM), you can guarantee that each bisect step sees the same conditions. This drastically reduces "works on my machine" fiascos.

Agree on this pattern for all code changes. Hard to understate the amount of time we've saved by testing against the full prod-like environment right away. An ephemeral env implementation makes this easy and low stakes, so diving right into E2E testing a copy of your real infra isn't wildly unreasonable. However, I work for Shipyard (https://shipyard.build) so I'm a bit biased on these processes.