3916.json

{
    "builders": [
        {
            "export_path": "image.tar",
            "image": "alpine",
            "run_command": [
                "-d",
                "-i",
                "-t",
                "{{.Image}}",
                "/bin/sh"
            ],
            "type": "docker"
        }
    ],
    "provisioners": [
        {
            "inline": [
                "echo foo > /root/foo"
            ],
            "type": "shell"
        },
        {
            "destination": "/tmp/foo",
            "direction": "download",
            "source": "/root/",
            "type": "file"
        }
    ]
}