docker-compose.yaml

networks:
  traefik-net:
    driver: bridge
  host-net:
    external:
      name: host

services:
 traefik:
    image: traefik:1.7.3-alpine
    container_name: traefik
    networks:
      - traefik-net
    restart: always
    ports:
      - target: 80
        published: 80
        mode: host
      - target: 443
        published: 443
        mode: host
  home-assistant:
    image: homeassistant/home-assistant:0.81.0
    networks:
      - host-net
      - traefik-net
    labels:
      traefik.enable: "true"
      traefik.port: 8123
      traefik.frontend.rule: "Host:example.com"
      traefik.frontend.entryPoints: "https"

Above is a sample, with some settings removed for simplicity.