Use BuildKit registry caching to speed up builds #114
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Switches from docker build to docker buildx build with --cache-from and --cache-to pointing to registry-based cache tags. This caches intermediate layers (notably the npm ci deps stage) across builds, saving ~1 min when package.json hasn't changed. Also removes the separate push step (buildx --push handles it) and the redundant images block. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
docker buildtodocker buildx buildwith registry-based layer cachingnpm cideps stage) across builds, saving ~1 min when dependencies haven't changedbuildx --pushhandles it) and the redundantimagesblock_IMAGEsubstitution to reduce repetitionHow it works
Each build pushes cached layers to
...:cache-prod/...:cache-stagingtags. Subsequent builds pull those layers before building, so unchanged layers (likenpm ci) are reused.First build after this merges will be the same speed (no cache yet). Subsequent builds should save ~1 min.
Test plan
🤖 Generated with Claude Code