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Docker BuildKit Cache Setup That Actually Speeds Up CI

Originally published on kuryzhev.cloud Last month a client asked me why their "cached" Docker builds still took nine minutes on every single pull request.

  • Docker BuildKit cache setup was failing due to stale :latest tag usage.
  • BuildKit cache computes digest based on base image, copied files, and resolved command.
  • Optimize CI cache by ordering Dockerfile layers and using pinned FROM digests.

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