Mercure simple development environment with docker

mercure.compose.yml

version: "3.7"
services:
  mercure:
    image: dunglas/mercure
    environment:
      MERCURE_PUBLISHER_JWT_KEY: 'changeme'
      MERCURE_SUBSCRIBER_JWT_KEY: 'changeme'
      SERVER_NAME: ":80"
      MERCURE_EXTRA_DIRECTIVES: |-
        cors_origins "http://127.0.0.1:8000"
        anonymous
    ports:
      - 8001:80