Applies the three suggestions of the review of #375:
- The runner's cleanup keeps one entry per key, whatever its scope: a PR
run that saves under the shared entry's key evicts it for every PR until
the next Monday, and two PRs on the same non-main lockfile evict each
other. Added to the list of cold runs.
- The cache key also hashes the job's CARGO*/RUST*/CC*/CFLAGS*/CXX*/CMAKE*
variables, and ignores the app's own version: changing env: means a cold
run until Monday, a release does not.
- A Monday restore that fails with a 404 after a quiet week is a known
runner race (forgejo/runner#1741), not #234 coming back.
Refs #234
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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