Aggiornamento fallisce con: Manca la presa "before-server" di Nginx... discourse_docker non è compatibile con la versione di Discourse scelta.

[chrisc (Chris Croome)]

I’ve tracked down the issue — it was caused by the discourse-images-guardian plugin from @mbcahyono which needed the nginx.sample.conf file updating, I have done this and created a pull request to fix it.