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The 'builder does not support multi-arch' subtest expects the docker driver to reject multi-platform builds, and skipped itself by checking that buildx lists both linux/amd64 and linux/arm64. That heuristic misses containerd-store hosts without binfmt emulation (plain CI runners): only native platforms are listed even though the driver happily cross-builds, so the build succeeds and the test fails with 'ExitCode was 0 expected 1'. Skip on the containerd image store directly, detected from the daemon's DriverStatus. Signed-off-by: Nicolas De Loof <[email protected]>