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actions/cache shells out to `tar --posix -P`. Alpine's busybox tar rejects both flags, so the cache step would fail in every job that runs inside these images — which is all of them once ci.yml switches over. coreutils does not cover this: tar is its own Alpine package. Add it, add zstd (which actions/cache prefers over gzip when present), and assert GNU tar in the image's smoke test so a future base-image change cannot quietly drop it again. Part of #187 Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01D9acV1mHktGAb1uyvNmrR2