Include OLS Dockerfile in seeded repo

See
https://github.com/EBISPOT/OLS#building-the-docker-images-manually
https://github.com/MaastrichtUniversity/ols-docker/blob/master/Dockerfile

@matentzn do you have any advice on how to go about this?

Should this go in the top level of template/

@hrshdhgd will need for making the allen OLS instance

Start with the OLS manual Docker image instructions and the MaastrichtUniversity/ols-docker Dockerfile linked in the issue. Inspect the seeded repo's template/ layout to determine the intended location; done means the OLS Dockerfile is included there for the Allen OLS instance.

Written by the indexing model from the issue text.