ci: disable rust-cache cache-bin on macOS-touching jobs#345
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The recent macos-15-arm64 / macos-15 runner images (rolled out around 2026-05-11) ship a pre-populated rustup state. Swatinem/rust-cache caches `~/.cargo/bin` by default since v2.8 (PR #325), and on the new image the cache restore overwrites a fresh toolchain install with stale rustup proxy binaries that run in installer mode rather than proxy mode. Subsequent `cargo build` invocations land on a rustup-init shim and exit with "unexpected argument 'build'". Retries pass only when the runner pool happens to assign an older image generation. Set `cache-bin: false` on the matrix `build` jobs in ci.yml and release.yml — the only places that target macOS runners. Lint and Test are Ubuntu-only and are not affected. See Swatinem/rust-cache#341, actions/runner-images#14099.
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Summary
Supersedes the PATH-append approach (which didn't actually work) and the prior action-swap (#342) (also didn't actually work). Real root cause traced via actions/runner-images#14099 → Swatinem/rust-cache#341.
The macos-15 and macos-15-arm64 runner images rolled out around 2026-05-11 ship a pre-populated rustup state.
Swatinem/rust-cache@v2caches~/.cargo/binby default since v2.8 (PR #325). On the new image, the cache restore step overwrites the freshly-installed rustup proxies with stale binaries that run in installer mode rather than proxy mode. Subsequentcargo buildcalls land on a rustup-init shim and exit withunexpected argument 'build'. Retries only pass when the runner pool happens to assign an older image generation — which is why the issue looked intermittent.The reported workaround is
cache-bin: false. Apply it to the matrixbuildjobs inci.ymlandrelease.yml— the only places that target macOS runners. Lint and Test are Ubuntu-only and not affected.Test plan
Build macos-latest / Build release binarypasses on this PR's first attempt/Users/runner/.cargo/bin)