Drop the layer-caching work: no CACHE_MODE, no registry buildcache tag, no buildx container builder, no scheduled cache-busting build, no no_cache input. Instead build with --no-cache --pull every time. Caching was working against the point of this repo: nothing is version-pinned, so a cached `apk add` layer keeps shipping whatever packages existed when it was first built, and a rebuild quietly stops meaning "current". --no-cache alone isn't enough either — it would still build on a stale local copy of the FROM image. Verified the only CACHED entries left are the `# syntax=` frontend image and --pull re-resolving the base manifest (unchanged digest). The apk and yq layers re-run every build. Costs ~40s per image, which also makes the four-node cache-sharing question moot. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>