Um eine neue Version zu installieren:
docker exec -ti flarum.smns-bw.org extension update --prefer-dist --no-plugins --no-dev -a --with-all-dependencies
docker exec -ti flarum.smns-bw.org extension require fof/oauth
docker exec -ti flarum.smns-bw.org extension update flarum-lang/german
docker exec -ti flarum.smns-bw.org extension why swiftmailer/swiftmailer