Docker install does not work anymore from today due to error MariaDB is not properly configured

same yml and .env, without any change to the folders and files on the host computer, yesterday and the day before yesterday, the docker-compose up command works as expected. but today it does not work anymore.
checked the relevant volume setting in docker-compose.yml and the file under installation folder still there

what maybe the reason the mariadb configuration file not take effect in the mariadb container?

how to debug and proceed.

Many thanks.

Check for file permissions?
Try exec into the mariadb container and confirm the cnf is loaded?