fix(ci): set explicit toolchain for mutation-test job#999
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The dtolnay/rust-toolchain action derives its default toolchain from the pinned ref name (@stable), but this repo pins every action to a bare commit SHA for supply-chain safety. With no ref to parse, the toolchain input resolved to empty and the Install Rust toolchain step failed with "'toolchain' is a required input", aborting the scheduled mutation-testing run before cargo-mutants could execute. Add the explicit "toolchain: stable" input, matching every other rust-toolchain invocation in the workspace.
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Problem
The scheduled Mutation testing workflow fails at the
Install Rust toolchainstep:Failing run: https://github.com/dekobon/big-code-analysis/actions/runs/28511806150
Root cause
dtolnay/rust-toolchaininfers its default toolchain from the ref name it is pinned to (@stable,@1.94, …). This repo pins every action to a bare commit SHA for supply-chain safety, so there is no ref for the action to parse — thetoolchaininput resolves to empty and the step aborts beforecargo-mutantscan run. (The follow-onupload-artifact"No files were found in target/mutants/" warning was just a downstream symptom.)mutation-test.ymlwas the only workflow missing the explicit input; all otherrust-toolchaininvocations acrossci.yml,release.yml,pages.yml, etc. already passtoolchain: stable(or a pinned version) for exactly this reason.Fix
Add the explicit
toolchain: stableinput, matching the sibling workflows. Validated withmake actionlint(clean).This workflow is
schedule/workflow_dispatchonly, so it is not exercised by PR CI — confirm via a manualworkflow_dispatchrun after merge.