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BusyBox tar rejects the --posix that actions/cache passes it, so neither the ccache nor the musl FFmpeg build was ever saved, and every run built both from scratch (ccache hit 3 of 1005 calls). Install GNU tar and zstd, and give the ccache a key of its own like the other jobs. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>