Test use of Singularity for running Docker container on HiperGator

[ethanwhite]

HiperGator doesn't have Docker (due to sudo requirement). Need to test using Singularity for running our Docker container.

Useful information:

• By default HiperGator runs Singularity 2.5, but using module load singularlity switches to 3.2
• Singularity docker docs
• Hipergator Singularity docs

[ethanwhite]

This seems to work at the moment:

1. login to hipergator (see https://github.com/weecology/lab-wiki/wiki/Programming:-HiPerGator-Intro-Guide)
2. ml ufrc (get a compute note)
3. ml singularlity (load newer singularity)
4. singularity pull docker://weecology/portal_predictions (download the docker container and convert into singularity container)
5. git clone https://github.com/weecology/portalPredictions.git (clone Portal Predictions repo)
6. cd portalPredictions (move into the portalPredictions repo)
7. singularity run ../portal_predictions_latest.sif Rscript install-packages.R (run the install script)
8. singularity run ../portal_predictions_latest.sif Rscript PortalForecasts.R (run the forecasting script)

[ethanwhite]

Works!