buildx failed with: ERROR: failed to solve: process "/bin/sh -c echo \"Y\" | slackpkg update && if [ \"$UPDATED\" = true ]; then slackpkg upgrade slackpkg || slackpkg upgrade-all || true; fi && slackpkg install openssh && rm -rf /var/lib/slackpkg/* && useradd demo && echo \"demo:demo\" | chpasswd && ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N \"\" && ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N \"\" && ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N \"\"" did not complete successfully: exit code: 127