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Cache Rust dependencies in a separate Docker layer - #76
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Insprill
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Oct 18, 2026
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The Dockerfile copies the whole source tree before running cargo, so any change rebuilds every dependency from scratch, and the gha layer cache never helps.
This builds the dependencies first against a placeholder main.rs, so that layer only changes when Cargo.toml or Cargo.lock do. Locally a source-only rebuild went from 100s to 48s; most of what remains is the LTO link of the final binary.