A nitpick. The two managed docker volumes created (at the very bottom) are not used by the container and only serve to cause confusion to the reader.

  services:
    baikal:
      image: ckulka/baikal:0.9.5
      restart: always
      ports:
        - "XXXX:80"
      volumes:
        - /mnt/baikal/data:/var/www/baikal/config
        - /mnt/baikal/data:/var/www/baikal/Specific

  volumes:
    config:
    data: