Error validating server certificate for 'https://code.ros.org:443'

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I am installing ROS Electric on OSX Lion (10.7) using the commands from the install page

rosinstall ~/ros "http://packages.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=electric&variant=desktop-full&overlay=no"

I keep having to validate the server certificate over and over again. I keep hitting (p) for permanently, but it doesn't seem to remember. How do I fix this? Now, to be clear, I eventually am able to download all of ROS (and with major modifications) get it up and running on OSX Lion. For linux there is a command to get and update keys:

wget http://packages.ros.org/ros.key -O - | sudo apt-key add -

What is the equivalent command for OSX (using key chains I assume) to avoid the following error?

Error validating server certificate for 'https://code.ros.org:443':
 - The certificate is not issued by a trusted authority. Use the
   fingerprint to validate the certificate manually!
Certificate information:
 - Hostname: *.ros.org
 - Valid: from Thu, 10 Sep 2009 23:16:35 GMT until Wed, 12 Sep 2012 05:05:53 GMT
 - Issuer: Equifax Secure Certificate Authority, Equifax, US
 - Fingerprint: fb:45:70:74:bf:12:94:01:05:23:8d:ee:b2:04:66:d0:f8:9a:e8:d2
(R)eject, accept (t)emporarily or accept (p)ermanently?