Use containers for github component testing

We have a number of repositories in escomp, esmci, and ncar which need to start with builds of supporting software like
netcdf, pnetcdf, hdf5, mpi - it is very time consuming to build all of these packages each time for each repo. I have been reading about how to use docker images in github actions and I believe that the images from this repo could be very useful in accomplishing that end. Following [this article ](https://evilmartians.com/chronicles/build-images-on-github-actions-with-docker-layer-caching) we can build the image and cache it for reuse. This should save considerable time in testing for a number of repos. I'm going to start with https://github.com/NCAR/ParallelIO and try to run testing in the base/centos8 container found here. If/when that proof of concept works I will want to add more Dockerfiles with different mpi layers and with different versions of the libraries.