Add option to build/run with Singularity container

**Is your feature request related to a problem? Please describe.**
Singularity seems to be more popular on HPC systems and Docker. 

**Describe the solution you'd like**
In addition to Docker, add a build option to create and run the profiler through a Singularity container.

https://sylabs.io/guides/3.5/user-guide/introduction.html