GitHub Packages for nnpdf
Created by: scarrazza
This PR implements:
- a github action triggered by tags which automatically builds docker images and push to github packages,
- a dockerfile which builds a linux image with the pre-installed nnpdf conda package,
- docs for CI and running the docker image
Should be sufficient to close https://github.com/NNPDF/nnpdf/issues/1384. Here the output of this procedure: https://github.com/NNPDF/nnpdf/pkgs/container/nnpdf
Closes #406 (closed).