s2s

Example for numerical weather prediction

to be added to initialised datasets

Data sources (to) implement(ed):

• GEFS https://www.ncei.noaa.gov/thredds/catalog/model-gefs-003/202008/20200831/catalog.html
• DWD https://opendata.dwd.de/weather/nwp/

relates to #600

Btw, we could add the possibility to do this in the plugin code:
cml.load_dataset("training-input", date="0201")
cml.load_dataset("training-input", date=slice("0101","0201" )
cml.load_dataset("training-input", date="01*")

Originally posted by @floriankrb in ecmwf-lab/climetlab-s2s-ai-challenge#21 (comment)

What are the common or useful regular expressions?
For builtin.yaml.