Provide Docker container

[de-code]

It's a bit similar to me having requested a Docker container for GROBID training.

Basically I want to make it easy to train on the cloud. i.e. I would just issue a command to run a Docker container in Kubernetes (but could also be run locally). One benefit for running it locally is also that there won't be much or any setup required, assuming Docker or Kubernetes is already configured.

I will progress that in a separate repo but thought it's worth sharing my motivation.