First run: create caddy network for other stacks to attach to:

docker network create caddy

Start the proxy

docker compose up

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Integrating with other stacks:

Add the external network:

networks:
  caddy:
    external: true

Add the caddy network and labels to the services you want to proxy:

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.