I removed mine since I moved away from Gitlab. There’s other comments with working docker composes, but here’s the latest working version of mine if you’re interested:

services:
  gluetun:
    image: ghcr.io/qdm12/gluetun:latest
    container_name: gluetun
    # line above must be uncommented to allow external containers to connect. See https://github.com/qdm12/gluetun/wiki/Connect-a-container-to-gluetun#external-container-to-gluetun
    restart: always
    cap_add:
      - NET_ADMIN
    devices:
      - /dev/net/tun:/dev/net/tun
    volumes:
      - ./data:/gluetun
    environment:
      ## ProtonVPN Wireguard
      - VPN_SERVICE_PROVIDER=custom
      - VPN_TYPE=wireguard
      - VPN_ENDPOINT_IP=${WIREGUARD_ENDPOINT_IP}
      - VPN_ENDPOINT_PORT=${WIREGUARD_ENDPOINT_PORT}
      - WIREGUARD_PUBLIC_KEY=${WIREGUARD_PUBLIC_KEY}
      - WIREGUARD_PRIVATE_KEY=${WIREGUARD_PRIVATE_KEY}
      - WIREGUARD_ADDRESSES=${WIREGUARD_ADDRESSES}
      - TZ=Etc/UTC
    ports:
      - ${QBITTORRENT_EXPOSED_WEBUI_PORT}:8080/tcp # qBittorrent Web UI

  qbittorrent:
    # https://docs.linuxserver.io/images/docker-qbittorrent
    build: .
    container_name: qbittorrent
    restart: always
    volumes:
      - ./config:/config
      # using download path as mount so other services can play nice
      - ${QBITTORRENT_DOWNLOAD_PATH}:${QBITTORRENT_DOWNLOAD_PATH}
      - ${QBITTORRENT_THEMES_PATH}:/themes
    environment:
      # https://github.com/linuxserver/docker-qbittorrent#umask-for-running-applications
      - PUID=${QBITTORRENT_WRITE_UID}
      - PGID=${QBITTORRENT_WRITE_GID}
      - UMASK=0002
      - TZ=Etc/UTC
      - WEBUI_PORT=8080
    network_mode: "service:gluetun"
    depends_on:
      gluetun:
        condition: service_healthy

  portcheck:
    image: eiqnepm/portcheck:latest
    container_name: portcheck
    restart: always
    environment:
      - QBITTORRENT_PORT=6881
      - QBITTORRENT_WEBUI_PORT=8080
      - QBITTORRENT_WEBUI_SCHEME=http
      - QBITTORRENT_USERNAME=admin
      - QBITTORRENT_PASSWORD=${QBITTORRENT_ADMIN_PASSOWRD}
      - TIMEOUT=300
      - DIAL_TIMEOUT=5
    network_mode: "service:gluetun"
    depends_on:
      qbittorrent:
        condition: service_healthy