ci(coin-matrix): clear orphaned conan download tempfiles on self-hosted#647
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An interrupted or racing conan download can leave a partial conan_package.tgz in the reused ~/.conan2 cache, making the next conan install abort with "the file to download already exists" (seen on bch smoke, master 465ded9). Re-running alone cannot clear it since the tempfile persists on the runner. Add a self-hosted-gated pre-install step that deletes orphaned conan_package.tgz/conan_sources.tgz staging archives so a missing binary package re-fetches cleanly; extracted packages are untouched.
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What
Adds a self-hosted-gated pre-
conan installstep in coin-matrix.yml that deletes orphanedconan_package.tgz/conan_sources.tgzstaging archives from the reused~/.conan2cache.Why
Master tip
465ded92bch smoke went RED with:An interrupted/racing conan download leaves a partial staging tgz behind; the next
conan installrefuses to overwrite it and aborts. This is a self-hosted environment race, not a code regression — but re-running alone cannot clear it, since the tempfile persists on the runner across jobs. Recurrence warrants hardening rather than perpetual re-runs.Scope
runner.environment != github-hosted(mirrors the existing "Clean stale build dir" step).Merge-gated: awaiting operator push-approval.