Consider a docker volume for app database

[jraviotta]

I'm interested in comments from the development community about the following user story and architecture feature. Admins, if you prefer to have this discussion on Reddit, I can move it there.

Given I am running zenbot in a docker container, I want my database content to persist after rebuilding containers so that I don't loose my trading history and have to re-import OHLCV data.

Additionally, I want to upgrade zenbot, without losing everything.

Presently, it appears that the app database is stored within the container and is discarded every time the container is re-built. Docker suggests storing data in a named volume so that containers can be created and discarded as needed without losing continuity.

A question about security has been raised as data in a container does persist beyond the life of the container. Additionally, there is a concern that even when the volume is destroyed, user data may still be retrievable from the Docker cache.

If anyone has expertise with Docker, please chime in.