buildx failed with: ERROR: failed to build: failed to solve: process "/bin/sh -c set -x; cd /var/www/bookstack && curl -sS https://getcomposer.org/installer | php -- --version=$COMPOSER_VERSION && /var/www/bookstack/composer.phar install -v -d /var/www/bookstack/ && rm -rf /var/www/bookstack/composer.phar /root/.composer && chown -R www-data:www-data /var/www/bookstack" did not complete successfully: exit code: 1