well, as per other post here (How to upgrade from 2.5.11 to 3.0 (docker)) it’s sort of working but a real mess.
I’ve got it up and running but now cannot get mysql/jdbc installed for persistence.
No persistence survived the upgrade and removing it and trying to re-add it does nothing and no (obvious) errors in log.
Sad but it’s been a really bad upgrade and I’ve lost a day now on it 