A bit more information would be good...?
Do you want to reset only the config itself then it's easy, stop the container, delete the config file (path is described in the description from the container) and start the container again <- be aware that you have to stop the container afterwards again since it pulls down the config file and you may want to change the server name, password and so on.
Do you want to reset the entire server it's also easy, stop the container and delete the Saves directory in Pal subdirectory <- same as above with starting/stopping the container.