Trying out the SHIELD container

Work on greatlakes.

Run singularity pull docker://gfdlfv3/shield in a directory $FV3_ROOT

Run

cd ${FV3_ROOT} \
  && wget https://zenodo.org/record/5090124/files/regional_Laura.zip \
  && unzip regional_Laura.zip \
  && mkdir cases \
  && mv regional_Laura cases \
  && wget