app.json

{
    "project": "buildit",
    "services": [
        {
            "id": "frontend",
            "apps": [
                {
                    "id": "builditfrontend",
                    "domain": {
                        "type": "HTTP",
                        "uri": "$domain"
                    },
                    "mem": 512,
                    "image": "gabrielo/builditapp",
                    "instances": 1,
                    "port_mappings": [
                        {
                            "container_port": 5001
                        }
                    ],
                    "env": {
                        "MESSAGE": "sloppy.io rulez!"
                    }
                }
            ]
        }
    ]
}