Add setup based on Docker Compose and/or Vagrant

[amotl]

It would be sweet to bring the whole setup into a sandbox setup based on Docker Compose and/or Vagrant. Specifically, the steps outlined in Luftdaten-Viewer Databases and Luftdaten-Viewer Grafana should be automated.

Likewise, in a subsequent iteration, this setup should be used to conduct end-to-end tests, and bring them to CI, see GH-51.

Please upvote if you think this is useful for you.