Never mind. Even though I performed “docker compose down” and completely removed the “/opt/mailcow-dockerized” directory. Then followed the instructions to install Mailcow using git clone and running the generate config script, something was left behind when I deleted the mailcow-dockerized directory. I assume perhaps an issue with the stable release docker images were not overwritten, I don’t know.
But, when I deleted all images, and performed “docker system prune –all”. I was able to install the nightly branch. It is now running, and I will perform my intended customization of using my own certs and LDAP.
Bottom line, I created the problem by not clearing all of the docker images before installing the nightly branch.