Trying to configure Redis as it has been done in 2.5 (by setting the variables CACHE_POOL=cache.redis and CACHE_DSN) ends up with:

In Container.php line 277:
                                                            
  You have requested a non-existent service "cache.redis".  

We should bring the possibility to setup Redis that way back, as it makes setting it up on Travis easier - there is a TODO here: https://github.com/ezsystems/ezplatform/blob/master/config/packages/ezplatform.yaml#L13