I tried to follow the instructions from
http://bitnami.com/article/how-to-install-services-on-osx
I replaced
<string>com.bitnami-drupal.services</string>
with
<string>com.bitnami-ruby.services</string>
The server services did startup on boot but for some reason the concrete5 and wordpress had trouble connecting with the mysql database. When I threw away the launch file and rebooted and manually restarted things were back to normal.
Ideas??