This is mostly a sample configuration, attaching to port 8080 on host. Copy settings.env.sample and adjust it accordingly (see compose yaml); together with: firewall settings, DNS, TLS certificates, cronjob for instant_backup.sh, off-site Backups, etcetera ...You may also want to run useradd -u 1000 --system vikunja once, and add these env-vars to the settings.env file: PUID=1000, PGID=1000. That fixed attachments for us. Good luck!