{
  "builders": [
    {
      "type": "docker",
      "image": "ubuntu",
      "export_path": "image.tar",
      "changes": [
        "USER www-data",
        "WORKDIR /var/www",
        "ENV HOSTNAME www.example.com",
        "VOLUME /test1 /test2",
        "EXPOSE 80 443",
        "LABEL version=1.0",
        "ONBUILD RUN date",
        "CMD [\"nginx\", \"-g\", \"daemon off;\"]",
        "ENTRYPOINT /var/www/start.sh"
      ]
    }
  ]
}