Odoo 13 docker compose with mounted custom addon

docker-compose.yaml

version: '3'
services:
  db:
    image: postgres:11
    environment:
      - POSTGRES_PASSWORD=odoo
      - POSTGRES_USER=odoo
      - POSTGRES_DB=postgres
    restart: always
  odoo:
    image: odoo:13
    depends_on:
      - db
    ports:
      - "8069:8069"
    tty: true
    command: -- --dev=reload -u my_module
    volumes:
      - ./addons:/mnt/extra-addons
      - ./etc:/etc/odoo
    restart: always