git clone gives all files the current timestamp, causing cargo to
recompile every workspace crate even when source is unchanged. Switch
to persistent checkout on the PVC: git fetch + git checkout --force
only updates files that actually changed between commits, preserving
mtimes on unchanged files so cargo correctly skips them.
- compile-services: /cargo-target/src persistent checkout
- compile-training: /cargo-target/src persistent checkout
- compile-and-train: /cargo-target/src persistent checkout + CARGO_HOME
- First run: full clone (fallback), subsequent: fetch + checkout
Expected: ~40 crate recompile → only changed crates (~1-2 min)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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