Current Dockerfile configuration is not for persistance

[foriequal0]

Related read: https://docs.docker.com/storage/#more-details-about-mount-types

Current configuration is volatile. The Dockerfile and the documentation don't provide a way to a persistent state between the node instances.

Dockerfile: https://github.com/CodeChain-io/codechain/blob/f2909594787e128a97552f982e1092e9d18c8705/docker/ubuntu/Dockerfile
Documentation: https://github.com/CodeChain-io/codechain/blob/master/README.md#setup