Add docker-compose and traefik

[yorickdowne]

This adds docker-compose, as well as traefik reverse proxy.

Fully understood if that's considered "too complex". It's how I run my eth nodes, and it came naturally to do the same for btc.

[CalebFenton]

Thanks for this. Saves me some time writing my own docker-compose and I see you fixed some other bugs too

[adadkins]

Can we get this merged in?

[kylemanna]

TCP front-ends and load-balancers are out of scope for this repo. There's nothing here preventing someone from building on top of this image to their heart's content.