Run Ghost in Docker compose

Experimenting with running Ghost in Docker compose. This is what I've started with: 

services:
  ghost:
    image: ghost:5-alpine
    restart: unless-stopped
    ports:
      - "3055:2368"
    depends_on:               # Ensure MySQL is ready before Ghost starts
      - db
    environment:
      # see https://ghost.org/docs/config/#configuration-options
      database__client: mysql
      database__connection__host: db
      database__connection__user: ghost
      database__connection__password: ${GHOST_DB_PASSWORD}
      database__connection__database: ghost
      url: https://da.nmilne.com
    volumes:
      - ghost:/var/lib/ghost/content

  db:
    image: mysql:8.0
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
      MYSQL_DATABASE: ghost
      MYSQL_USER: ghost
      MYSQL_PASSWORD: ${GHOST_DB_PASSWORD}
    volumes:
      - db:/var/lib/mysql

volumes:
  ghost:
  db:

Pretty straightforward.