Additional flags for containers about sos

[BoPeng]

You are right, currently the singularity mode only supports the bind option, not nv. There are also a number of other options that could be supported.

It also does not support singularity run, only singularity exec.

Let me see if I can come out with a quick fix.

[BoPeng]

This has been fixed in the 1500 branch, but I am not sure what to do with singularity run since it runs the script built in the container, not the scripts we provide. If you actually meant docker exec --nv, I can merge the branch and close the ticket.

[tfabiha]

I'll be able to run with singularity exec. Thank you so much for such a quick response!

[BoPeng]

I have updated test and doc, and released sos 0.23.2.