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

    env_file: env/instance.env
    volumes:
      - ./etc/instance/server.crt:/usr/syno/etc/ssl/ssl.crt/server.crt
      - ./etc/instance/server.key:/usr/syno/etc/ssl/ssl.crt/server.key
...