podman/test/compose/env_and_volume/docker-compose.yml

version: '3'
services:
  writer:
    environment:
      - PODMAN_MSG=podman_rulez
    build: write
    ports:
      - '5000:5000'
    volumes:
      - data:/data
  reader:
    build: read
    ports:
      - '5001:5000'
    volumes:
      - data:/data
volumes:
  data: