Just tried.
Indeed the file is recreated. When I restart the docker, still the error 500. I fixed it by doing the commend grant all privileges on <db_name>.* to '<db_name>'@'%' identified by '<db_password>';
I can now connect to the website, no error 500. But my app were not installed.
What concerns me here is that the site creator didn’t go through the whole process. So I guess that everything is not installed correctly.
I could of course connect to the docker and reinstall the apps with the bench command. But I look for a solution that works from the docker compose command without any further interventions. This will run through a CD pipeline.