Test automatically via Github actions

[d-w-moore]

See this prototype : https://github.com/trel/python-irodsclient/tree/ghrunner

[d-w-moore]

I've since done some work in similarly named dev branches at https://github.com/d-w-moore/python-irodsclient but that work needs a bit more development and personal research on certain inner workings of docker-compose. Eventually this will replace the Jenkins based docker-compose tests I now do for new releases.

[alanking]

Excellent work, @d-w-moore