services:
  keepalive:
    build:
      context: .
    restart: unless-stopped
    # keepalive reads no environment variables: every setting lives in the
    # config file below. Coolify still injects its dashboard variables through
    # its generated .env, so nothing needs declaring here.
    #
    # The app has no HTTP server. `expose` only mirrors the port the Coolify
    # app was configured with; it publishes nothing on the host, and nothing
    # answers on it.
    expose:
      - "3000"
    # The app reads /config.yml (see config.go). Coolify turns this bind mount
    # into an editable file storage; locally, copy config.example.yml to
    # config.yml first. The real config holds datastore credentials, so never
    # commit it.
    volumes:
      - ./config.yml:/config.yml:ro
    # No healthcheck: the distroless image ships no shell or HTTP client to
    # run one, and the Dockerfile defines none.