Initial add simple prod ready Dockerfile refs #57

[macropin]

Multi-stage build based off official python:3.6-slim

Example usage:

docker run --rm -t -i -p 9000:8001 -v $(pwd)/db:/db datasette datasette serve /db/chinook.db

[simonw]

Works for me. I'm going to land this.

Just one thing:

simonw$ docker run --rm -t -i -p 9001:8001 c408e8cfbe40 datasette publish now
 The publish command requires "now" to be installed and configured 
Follow the instructions at https://zeit.co/now#whats-now

Maybe we should have the Docker container install the "now" client? Not sure how much size that would add though. I think it's OK without for the moment.