Docker cache mounts explained for reliable multi-stage builds

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A developer article explains Docker's two cache mechanisms: instruction/layer cache and cache mounts. It presents a helper function to validate cache mount parameters in Dockerfiles for multi-stage builds. The helper ensures mount targets use safe characters and absolute paths while providing sensible defaults. Cache mounts reduce download costs during rebuilds but don't persist across fresh builder instances. This approach helps developers troubleshoot Docker build performance separately from CI environment issues.

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