ci: disable incremental compilation and debug info in CI#9
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Set CARGO_INCREMENTAL=0 and CARGO_PROFILE_DEV_DEBUG=0 for the test cache build. Incremental compilation adds ~10% overhead on clean CI builds and bloats the target directory. Debug info level 2 (default) increases binary size and link time without benefit in CI where we don't debug interactively.
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What
Disable incremental compilation and debug info generation in the CI test cache build.
Why
Two env var defaults hurt CI performance:
CARGO_INCREMENTAL (default: 1 in dev profile): Incremental compilation adds tracking
overhead (~10%) to clean builds and bloats the target directory, making cache save/restore
slower. CI builds are almost always clean — there's no prior state to be incremental against.
Every major Rust CI optimization guide recommends
CARGO_INCREMENTAL=0.CARGO_PROFILE_DEV_DEBUG (default: 2): Full debug info increases binary size, link time,
and cache size. CI runners don't need debug symbols for interactive debugging.
The Change
In
.github/workflows/create-cache.yml, add two env vars:2 lines added in 1 file.
Metrics to Track
Security Checklist
Part of CI Optimization Series
PR 8. Quick-win env var optimizations.