First run: create caddy network for other stacks to attach to:
```sh
docker network create caddy
```

Start the proxy
```sh
docker compose up
```

---

Integrating with other stacks:

Add the external network:
```yml
networks:
  caddy:
    external: true
```

Add the `caddy` network and labels to the services you want to proxy:
```sh
services:
  app:
    networks:
      - default
      - caddy
    labels:
      caddy: example.localhost # The domain this app should use.
      caddy.reverse_proxy: "{{upstreams 80}}" # The internal port that the container is listening on.
```