Add a startup function to the registry.
Add a startup function to the registry. This is a function that will get called once glue has been started and any data loaded, and can be used to set up specific layouts and create links.
Startup actions are triggered by either specifying comma-separated names of actions on the command-line:
or by passing an iterable of startup action names to the
The startup function will be given the session object and the data collection object.