sccache forces CARGO_INCREMENTAL=0, causing all 37 workspace crates to
recompile from scratch every CI run (~20 min). Only upstream deps were
cached (635 hits); 109 workspace rlib crates were non-cacheable.
Changes:
- Add cargo-target-cpu and cargo-target-cuda PVCs (30Gi each)
- Mount persistent target dir at /cargo-target via CARGO_TARGET_DIR
- Drop RUSTC_WRAPPER=sccache and SCCACHE_DIR from both compile steps
- Drop hardcoded CARGO_BUILD_JOBS=14 (let cargo auto-detect from nproc)
- Add 25GB cleanup guard to prevent unbounded PVC growth
- Update binary copy paths to use $CARGO_TARGET_DIR/release/
First build (cold PVC) is same speed. Subsequent builds with typical
3-5 file changes should drop from ~20 min to ~2-3 min via incremental.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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