ci: cache Rust deps and enable sccache for Tauri release builds - #33
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release.yml's 4-platform Tauri matrix rebuilt every Rust dependency from scratch on every pull_request, with no actions/cache or Swatinem/rust-cache step present. The macOS-intel and Windows legs alone cost ~1200-1500s median per run. Add Swatinem/rust-cache keyed on matrix.target to cache ~/.cargo and src-tauri/target, and layer sccache on top via RUSTC_WRAPPER + SCCACHE_GHA_ENABLED so partial-invalidation builds (e.g. a single crate bump) also get compiler-level cache reuse. Signed-off-by: Tim Nunamaker <tnunamak@gmail.com>
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Summary
release.yml's 4-platform Tauri matrix (macOS-arm, macOS-intel, Linux, Windows) had no Rust/Cargo cache — everypull_requestrebuilt all Rust dependencies from scratch. The macOS-intel and Windows legs cost ~1200-1500s median per run inBuild unsigned Tauri appalone (see CI speed report, item ci: update all GitHub Actions to latest and pin to commit SHAs #1).Swatinem/rust-cache@v2.9.2keyed onmatrix.target, scoped tosrc-tauri -> target.mozilla-actions/sccache-action@v0.0.11on top viaRUSTC_WRAPPER/SCCACHE_GHA_ENABLED, for compiler-level cache reuse on partial-invalidation builds (e.g. a single crate version bump) that a dependency cache alone wouldn't help (item chore: add Apache-2.0 SPDX license headers #4).No job/step names changed, no triggers changed, no gate semantics changed — purely additive caching steps. Only required status check on this branch is
DCO.Test plan