3 Weird Tricks to Make Docker Builds Go Vroom
summary
Three concrete tricks: enable GitHub Actions Docker build action caching so build layers persist in the Actions cache, cutting a small image from 44 seconds to 22 seconds on consecutive builds; order Dockerfile layers so base image and system deps come first, install only dependency manifests before copying source, and copy source last; use cache mounts to restore pip/go mod caches during build so downloads are reused and bandwidth is saved.
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