I used to run Joomla on Stackato. It worked great, but we needed to do a bit of hackery to set up the configuration files properly and we needed to use a persistent filesystem service. This is the old sample app repo:

 https://github.com/Stackato-Apps/joomla-cms

It's a pretty old version of Joomla, and it would not work on a modern CF without some modification (e.g. the manifest is invalid). Unless Joomla has changed how it handles storage, your CF will need a Volume Service for persisting files across instances and restarts as mentioned above.


TT