It was a long journey, as I had to first learn more about Linux, and VMs and Linux file attributes which were some big challenges. I also had to create many test servers to experiment with Docker commands to get the /local/notesdata volume mapped to a fixed volume outside of the container. This way, I can destroy the container and upgrade to rebuild with no loss of information. The only thing I have not yet gotten to work (more than once) is the new one-touch setup in Domino 12. I suspect that may be a problem between my keyboard and chair.
Anyway, I did not accomplish this alone. Several people in the Domino community were of help to me, mostly through their blogs and some answers email questions.
To all of you, thank you.