ci: install cargo-llvm-cov as a prebuilt binary#143
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The coverage job currently runs 'cargo install cargo-llvm-cov --locked'
which compiles the tool from source on every run (typically several
minutes). taiki-e/install-action@v2 downloads the matching prebuilt
binary directly from the cargo-llvm-cov GitHub releases — same tool,
no compile.
Same command runs afterwards ('cargo llvm-cov --workspace ...'); only
the install step is replaced.
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Summary
coveragejob currently runscargo install cargo-llvm-cov --locked, which compiles the tool from source on every run (typically several minutes).taiki-e/install-action@v2downloads the matching prebuilt binary directly from thecargo-llvm-covGitHub releases — same tool, no compile.cargo llvm-cov --workspace …runs unchanged afterwards.This is independent of #142 (rust-cache); they layer cleanly —
rust-cachewon't help the cold first run, andtaiki-e/install-actionkeeps source-compilation out of the loop entirely.Test plan
cargo llvm-covinvocation or its flags.taiki-e/install-action@v2is a widely-used standard action and ships officialcargo-llvm-covbinaries.