rob thijssen 15ded3a5bd ci: cache target/, disable incremental, drop redundant build ...

Three complementary tweaks to close the gap sccache alone can't:

- CARGO_INCREMENTAL=0: reclaims the 17 incremental-mode cache misses
  per run and prevents cargo from writing incremental fingerprints
  that defeat sccache. Incremental mode is useless in CI anyway since
  each run starts from scratch.
- actions/cache for ~/.cargo and target/: sidesteps sccache's
  structural limits (proc-macro non-cacheables, clippy-vs-rustc
  separate namespaces) by caching the whole build output keyed on
  Cargo.lock. Also caches ~/.cargo/bin so the installed sccache
  binary survives between runs.
- Drop the separate 'cargo build' step: 'cargo test --workspace'
  builds everything anyway, so the standalone build was a full
  redundant workspace compile pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-16 09:44:45 +03:00

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