buildx failed with: ERROR: failed to solve: process "/bin/sh -c set -exo pipefail; curl -fsSL --retry 3 -o ${KUBECTL_FILE} ${KUBECTL_URL}; sha256sum ${KUBECTL_FILE} | grep ${KUBECTL_SHA256}; mv ${KUBECTL_FILE} ${INSTALL_DIR}/${KUBECTL_FILE}; chmod +x ${INSTALL_DIR}/${KUBECTL_FILE}" did not complete successfully: exit code: 22