ci: CCache churns through available space too quickly

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1 patchset tracked - current t139882_6

v6t139882_6posted Jun 17, 22:02no CIwon't retrystale 2mopg 20
base033f39e69 Aug 18, 12:10 on master
applyapplied Aug 18, 13:39
rebaselast tried Aug 18, 13:39 on 033f39e69
skippedpatchset touches .github/
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