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Debian-based Docker images install /etc/apt/apt.conf.d/docker-clean which runs 'apt-get clean' after every apt-get install — wipes out /var/cache/apt/archives so there's nothing for actions/cache to save. Fix: remove the docker-clean drop-in and add keep-cache config first thing in each job, before any apt activity. Also bump apt cache key to v2 since the previous v1 was always empty. Wait time on the Wine + Inno Setup step should drop from ~1m20s to ~10s on warm runs (debs already in /var/cache/apt/archives, dpkg just installs them locally). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>