Add docker compose file

[rlh1994]

Is your feature request related to a problem? Please describe. Using the default provided docker run script you generate a new container every time you start and stop the image, using a compose file avoids this issue and allows for easier mangement of configurations to the container.

Describe the solution you'd like A docker compose file added to the repo, I am not sure if it would be part of the repo proper or just in the readme.

Describe alternatives you've considered Add --rm tag to call

Additional context I believe the basic file would be as follows, but there may be further options that are defaults that could be added so it's easier to customise:

version: "1.0"
name: snowplow_micro

services:
  micro:
    image: snowplow/snowplow-micro:latest
    ports:
      - "9090:9090"
    volumes:
      - type: bind
        source: ./example/
        target: /config
    command: --collector-config /config/micro.conf --iglu /config/iglu.json