By default no plugins are installed, however you can install whatever plugins you'd like when the container starts up.
On start it'll search the config directory for a file called "pluginsInstallList" which should have whichever plugins you'd like installed (take a look at the pluginsInstallList.Example file for an idea of how to format it - just one plugin name per line with one empty line at the end).
After starting up and installing all the plugins, the file name will have .done appended to it so the plugins don't install every time the container starts up - leads to really long start up times.