BittorentVPN

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version: "3.3"
services:
  qbittorrentvpn:
    image: trigus42/qbittorrentvpn
    container_name: qbittorrentvpn
    privileged: true   
    environment:
      ## Not needed when using Wireguard
      # - VPN_USERNAME=myvpnusername
      # - VPN_PASSWORD=myvpnpassword
      - PUID=998 #optional
      - PGID=100 #optional
      ## This environment variable doesn't exist
      # - WEBUI_PORT_ENV=8991 #optional
      ## This neither
      # - INCOMING_PORT_ENV=8999 #optional
      - VPN_ENABLED=yes
      - LAN_NETWORK=192.168.1.0/24 # Or 192.168.0.0/24 depending on network
      - NAME_SERVERS=1.1.1.1,1.0.0.1

    ports:
      ## As you mentioned you need to set WebUI\HostHeaderValidation=false in the qBittorrent.conf but then this is perfectly fine
      - 8991:8080
      ## You probably don't want to be directly connectable (circumventing the VPN)
      ## If you want to be connectable, you have to use a VPN that allows port forwarding (you don't have to connectable for most things, except if you use private trackers)
      ## This didn't do much anyway cause you didn't allow the ports in the firewall using ADDITIONAL_PORTS
      # - 8999:8999
      # - 8999:8999/udp
    volumes:
      - /srv/path/Files/QBittorentVPN/config:/config
      - /srv/path/Files/QBittorentVPN/downloads:/downloads
    restart: unless-stopped

set WebUI\HostHeaderValidation=false in the qBittorrent.conf

NE MARCHE PAS AVEC VIVALDI !