Add Dockerfile
Add Dockerfile

- Uses dumb-init to handle signals properly.

nyarly/sous,samsalisbury/sous,samsalisbury/sous,samsalisbury/sous,opentable/sous,opentable/sous,samsalisbury/sous,nyarly/sous,nyarly/sous,opentable/sous,opentable/sous,opentable/sous,samsalisbury/sous