version: '3.8'
services:
  # An ephermerally-stored postgres database for single-use test runs
  db_test: &db_test
    image: postgres:14.11-alpine
    environment:
      - POSTGRES_USER=pg
      - POSTGRES_PASSWORD=password
    ports:
      - '5433:5432'
    # Healthcheck ensures db is queryable when `docker-compose up --wait` completes
    healthcheck:
      test: 'pg_isready -U pg'
      interval: 500ms
      timeout: 10s
      retries: 20
  # A persistently-stored postgres database
  db:
    <<: *db_test
    ports:
      - '5432:5432'
    healthcheck:
      disable: true
    volumes:
      - link_db:/var/lib/postgresql/data
volumes:
  link_db: