The Windows desktop build now succeeds (artifact builds + uploads), but the
job was marked failed on the post-job cache *save*: build-binaries
(windows-x64) and build-desktop-windows share runner.os/arch and thus the
same cache key, so concurrent saves hit "unable to reserve cache ... another
job may be creating this cache." Adding github.job to the key gives each job
its own cache and eliminates the race.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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