[Feature] Add official dockerfile + dockercompose

[jdorel]

It would be awesome to add an official dockerfile + dockercompose so that installation is quick and easy. For example the following repo implements it : https://github.com/ogarcia/docker-taskd.

Should you agree with this, I'll be happy to work on it (i'll use it as an excuse to build a proper Dockerfile :) ).

[tamis-laan]

+1 currently in need of this myself.

[jakec-dev]

+1

[S1SYPHOS]

Would love to see this happening!