Persist couchdb data across container restarts

**Is your feature request related to a problem? Please describe.**
Currently data stored in couchdb is removed when the container restarts

**Describe the solution you'd like**
Use docker volume mounts to persist data across restarts

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.