App Platform - Internal Service fails Health Check

I have an internal service which communicates with the main HTTP Server via AMQP (on an external RabbitMQ instance). It does not intentionally expose any TCP ports or intercept any HTTP requests.

How do I get this to pass the health check on App Platform?

I’ve configured it like so:

  - name: my_internal_service
    dockerfile_path: Dockerfile
    source_dir: /
    github:
      branch: main
      deploy_on_push: true
      repo: <GITHUB>/<REPO>
    instance_count: 1
    instance_size_slug: basic-xxs
    internal_ports:  # won't need this anyway
      - 3000