In order to help users deploy Layotto with Docker, we want to provide a Docker image.
Considering that the configuration files in the Docker image are hard-coded, and users may extend their own configuration files and their own images, we can provide some basic Dockerfiles. When users want to extend image, they just write FROM xxx.

Specifically, we need to prepare several Dockerfiles:

• A basic Dockerfile
• An example Docerfile for extension, that is, FROM the basic Dockerfile, and then change the configuration to extend.

Note: At present, the existing Dockerfiles in the build/contrib/builder/image directory are used for quickstart demo, which have some hard code such as starting etcd, and there is no common base image.