Support for Docker Rootless mode

[andzno1]

Currently the container does not work in Rootless mode, since the container relies on file permissions for different users (www-data, mysql). Running in Rootless mode will set the owner for all mounted files and directories to root inside the container if the mounted files on the host are owned by the user running the docker container.

When changing the owner on the host to e.g. www-data, the files inside the container will be owned by nobody:nogroup, since the files on the host are not owned by the user running the docker container.

Is there a chance to make the container work in Rootless mode?