buildx failed with: ERROR: failed to solve: process "/bin/sh -c set -x; curl -SL -o bookstack.tar.gz https://github.com/BookStackApp/BookStack/archive/v${BOOKSTACK_VERSION}.tar.gz && mkdir -p /bookstack && tar xvf bookstack.tar.gz -C /bookstack --strip-components=1 && rm bookstack.tar.gz" did not complete successfully: exit code: 2