amazon-web-services – AWS Beanstalk docker镜像自动更新不

我有一个node.js应用程序打包在一个公共存储库中托管的docker镜像中.

我已成功将该映像部署在AWS Beanstalk docker应用程序中.
问题是我期望在更新公共存储库中的映像时自动更新Beanstalk应用程序,如下面的配置所示.

Dockerrun.aws.json：

{
  "AWSEBDockerrunVersion": "1","Image": {
    "Name": "peveuve/dynamio-payment-service","Update": "true"
  },"Ports": [
    {
      "ContainerPort": "8000"
    }
  ],"Logging": "/var/log/dynamio"
}

Dockerfile非常简单：

FROM node:4.2.1-onbuild
# Environment variables
ENV NODE_ENV test
ENV PORT 8000
# expose application port outside
EXPOSE $PORT

亚马逊文档很清楚：

Optionally include the Update key. The default value is “true” and
instructs Elastic Beanstalk to check the repository,pull any updates
to the image,and overwrite any cached images.

但是我必须通过上传新版本的Dockerrun.aws.json描述符来手动更新Beanstalk应用程序.我错过了什么？它应该像那样工作吗？