chore: Add dockerfile and docker-compose

[swederik]

Similar to the dockerization branch and the PR here: #20

This adds:

• Dockerfile for standalone usage using PouchDB in a single container (USE_POUCHDB=true)
• docker-compose for two-container usage using CouchDB as a separate container

The dockerfile runs them using supervisord, and will conditionally start PouchDB if the flag is set. If you want to use PouchDB you should expose port 5984 as well.

Both of them seem to work fine for me, though we may need to add some startup script to create _users, _replications, etc... for normal CouchDB setups.

TODO:

• Is this the right docker name? What are we using right now?
• Make the CI workflow build and push new versions to Docker on merge, or optionally per PR

[emelalkim]

Hi Erik,
It seems fine, I especially like the pouchdb addition.
I don't know much about supervisord, so I cannot really comment on that
But I have some security concerns. For security reasons it is not recommended for containers to run with sudo user, we are using node user for epad distribution (here is a link to dicomweb-server Dockerfile we use). and you are giving 777 mod to the scripts, is that required?
Finally, you don't have to use server-config.js, you can pass everything with environment variables defined in development.js, please use those instead for integrity

[emelalkim]

Hi Erik, any update or comment on the recommended changes?

[swederik]

Yep I made the changes now, you can re-review and merge I think and I'll get around to adding the auto-push to dockerhub via CircleCI later