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acngtool shrink is insufficient to maintain acng cache size

In build-tails we call acngtool shrink 10G before each build to prevent the cache from running out of disk space. From what I can tell it doesn’t clean APT indices correctly, e.g. in my /var/cache/apt-cacher-ng/time-based.snapshots.deb.tails.boum.org/debian I have snapshots dating back to January 2017. Each such snapshot takes 30-120 MB (especially the old ones with multiarch are large) so it adds up, for me to 8 GBs. :S

Either we need to improve acngtool (for everyone’s benefit) or we manually find snapshots older than six months (or whatever) and purge them from acng’s cache.

Feature Branch: bugfix/16020-fix-cache-shrinking

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Original created by @anonym on 16020 (Redmine)

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