How to remote debug rspec tests running in teamcity with rubymine?

Hi,

I'm trying to debug an rspec test failing only on a teamcity agent and it only happens when run through teamcity not directly on the agent.  I'd like to run a remote debugging session so that I can set a breakpoint in the code that is failing and diagnose further through RubyMine.  Any pointers to documentation that explains how to do this would be great.

Thanks,
Jay