Don't persist data in test docker environment

[Holzchopf]

Introduction

The way docker-compose.yml is set up, it's not possible to "unmount" volumes for cases when data persistence is not desired (i.e. in testing). There should be a base compose file with no volume mounts which can be extended for the case when persistence is needed.

Acceptance Criteria

• [ ]

Open Questions

Context

#55

Implementation

See also #173

Use https://docs.docker.com/compose/how-tos/multiple-compose-files/extends/