services:
  database:
    # Use the official Postgres image from Docker Hub
    image: postgres:15-alpine
    # Restart the container if it fails
    restart: always
    # Use a volume to persist the database data
    volumes:
      - ${POSTGRES_VOLUME_NAME}:/var/lib/postgresql/data
    # Load environment variables from the .env file
    env_file:
      - .env

  semaphore:
    # Use the official Semaphore image
    image: semaphoreui/semaphore:v2.9.2
    # The application depends on the database service
    depends_on:
      - database
    # Restart the container if it fails
    restart: always
    # Map the host port to the container's fixed port 3000
    ports:
      - "${SEMAPHORE_PORT_HOST}:3000"
    # Load environment variables from the .env file
    env_file:
      - .env
    # The command to run the Semaphore container, which will wait for the database
    command: >
      sh -c 'while ! pg_isready -h database -p 5432 > /dev/null 2> /dev/null; do sleep 1; done && /usr/bin/semaphore --config /etc/semaphore/semaphore.json'

volumes:
  # Define a named volume for the persistent database data
  ${POSTGRES_VOLUME_NAME}: