Add provenance to model generation

[sverhoeven]

Use https://github.com/recipy/recipy to track the input files, model generation script version and output files.

[jspaaks]

maybe simpler to implement is a script that makes tar balls out of the built containers.

[sverhoeven]

Good suggestion

We could also use cwltool --provenance model-generation.cwl , to capture provenance info.
It doesnt tar Docker image, but records image name+label.

[jspaaks]

for the record, this may be helpful https://medium.com/@sh.tsang/docker-tutorial-4-exporting-container-and-saving-image-c3a7d792cfb6 (havent tried it though)