packer.json

{
  "builders":[{
    "type": "docker",
    "image": "ubuntu",
    "commit": true
  }],
  "provisioners":[
    {
      "type": "shell",
      "inline": [
        "apt-get -qq -y update",
        "apt-get -qq -y install curl"
      ]
    }
  ],
  "post-processors": [{
    "type": "docker-tag",
    "repository": "packer-sample",
    "tag": "0.1"
  }]
}