buildx failed with: ERROR: failed to solve: dockerfile parse error on line 16: unknown instruction: &&

buildx failed with: ERROR: failed to solve: process "/bin/sh -c cd /var && rm -rf /var/www && composer create-project contentacms/contenta-jsonapi-project www --stability dev --no-interaction && \tln -sf /opt/drupal/web /var/www/html \t && rm -rf \"$COMPOSER_HOME\"" did not complete successfully: exit code: 1

buildx failed with: ERROR: failed to solve: dockerfile parse error on line 16: unknown instruction: &&