---
version: "3"
services:
  instance:
    build:
      context: .
    container_name: autossl-udm
    hostname: autossl-udm

    env_file: env/instance.env
    volumes:
      - ./etc/instance/mnt/data/unifi-os/unifi-core/config/:/mnt/data/unifi-os/unifi-core/config/
...