Phabricator not compatible with included PHP version

[Lippur]

Maniphest throws the following error when viewing any task:

The same or similar error appears in numerous other places, e.g. application settings.

It seems that the PHP version included with this container is too new and Phabricator does not support it. This makes most parts of the application completely unusable.

This Docker image includes PHP 8.2, but the task for making Phabricator compatible with PHP 8.* is still open in their issue tracker with a huge amount of tasks still to be solved. Considering that there isn't really much work going into Phabricator anymore, it might be better to stick with 7.* for the time being.