Have a fixed environment for paper

Created by: wilsonmr

Minimally something like this:

activate <environment-name>
conda env export > <environment-name>.yml

#For other person to use the environment
conda env create -f <environment-name>.yml

But perhaps we also want to be able to quickly verify that the person that ran some results did indeed use the right settings. If we had an action that could do this and output a tag or False where the tag is some kind of version of the environment and False would be if the check fails. Then you could see on a report it would say <nnpdf4.0> or perhaps we could save the tag in the folder when we upload to server so it applies to fits, pdfs or reports.

Edit by @Zaharid : Please see this comment for instructions on installing the environment https://github.com/NNPDF/nnpdf/issues/1126#issuecomment-797117499