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hailongzhao
176aa0d02b
The global `ARG TARGETPLATFORM=linux/amd64` in Dockerfile.sandbox overrode the per-platform value BuildKit injects, so the multi-platform CI build ran every platform on the amd64 rootfs and only relabeled the arm64 config. The published arm64 entries of main, latest and main-desktop are byte-for-byte the amd64 layers. The stage-level `ARG TARGETARCH=amd64` had the same effect, so the cube "amd64 only" guard could never fire. - Declare TARGETPLATFORM without a default and fall back to linux/amd64 in FROM only when it is empty (legacy builder). - Fail the runtime stage when the rootfs architecture differs from TARGETARCH. - cubesandbox-base:2026.16 publishes linux/arm64 as well, and Cube runs on arm64 bare-metal KVM (PVM stays x86_64-only). Follow TARGETPLATFORM for cube-base, replace the amd64-only guard with an envd-vs-rootfs check, and build cube / desktop-cube for linux/amd64,linux/arm64 in CI and build_images.sh.