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

version: '3.3'

services:
  test:
    image: alpine
    command: ["top"]
    hostname: foobar
    networks:
      net1:
        aliases:
          - foobar

networks:
  net1:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 10.123.0.0/24