buildx failed with: ERROR: failed to build: failed to solve: process "/bin/bash -o pipefail -c set -eux; mkdir -p /build/initramfs; if [ -f .config ]; then if ! yes \"\" | make oldconfig; then make defconfig; fi; else make defconfig; fi; make -j\"${BUILD_JOBS:-$(nproc)}\"; make CONFIG_PREFIX=/build/initramfs install; if [ ! -x /build/initramfs/bin/busybox ]; then echo \"ERROR: busybox install did not produce /build/initramfs/bin/busybox\"; echo \"workspace /build contents:\"; ls -la /build || true; echo \"busybox tree:\"; ls -la /build/initramfs || true; exit 1; fi; strip --strip-all /build/initramfs/bin/busybox || true; tar -C /build -czf /build/initramfs.tar.gz initramfs" did not complete successfully: exit code: 2