RUBY-10458 - How do I add a CA certificate to RubyMine on OS X?

Hi

I (probably wrongly) filed a Bug report: http://youtrack.jetbrains.net/issue/RUBY-10458

I want to add a CA certificate to RubyMine for our JIRA instance.
it worked on Linux machines with the Java keytool, but I have not a clue how to add it to RubyMine on my OS X machine.

Pointers on how to acchieve this are very welcome :)

Kind Regards

Peter