Fehler beim Starten des Userland-Proxys: listen tcp4 0.0.0.0:443: bind: Adresse bereits in Verwendung

[pfaffman (Jay Pfaffman)]

You should see Discourse official Standard Installation and How to set up Discourse on a server with existing Apache sites.

Judging from the path you include, You might also check Troubleshooting Bitnami Installations