Sorry George but I’m not a docker expert and while I use windows docker, I always use an openemr image. Mostly the development-easy from openemr/docker directory.
Have you looked into https://hub.docker.com/r/openemr/openemr/?
Likely an issue with mariadb client on alpine linux connecting to mysql database (since those tools use alpine linux client rather than the standard openemr database connector).
For the older mysql 8.* versions have needed to do the following for it to work (--default-authentication-plugin=mysql_native_password):
Recommend the following for a starting point for 7.0.2 when using the production openemr dockers: