The new windows-host cache steps reported '::warning::Failed to save' and
nothing ever seeded. actions/cache probes for zstd, doesn't find it, falls
back to gzip — and Git's GNU tar then shells out to a gzip that is not on
the runner daemon's PATH: 'Child returned status 127', 'cache.tgz: Cannot
write: Broken pipe', tar exit 2. Since save failures are warnings, the job
stayed green while caching silently did nothing.
zstd (+ a staged gzip.exe as insurance) now installs into its own directory
— never Git's usr\bin on PATH, which would shadow Windows' find/sort/echo.
Applied live to the runner and added to the machine PATH; this step keeps a
rebuilt runner honest.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5
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