packer-cn/command/test-fixtures/push-builds/template.json

{
    "builders": [
        {"type": "dummy"},
        {"type": "dummy", "name": "foo"}
    ],

    "post-processors": [{
        "type": "atlas",
        "only": ["dummy"]
    }],

    "push": {
        "name": "foo/bar"
    }
}