Upgrade CDash from 2.6.0 to 3

I’m posting here as I can’t find any resource elsewhere. Please forgive me if it’s out of place.
I’m trying to migrate a CDash installation on version 2.6 to a new server and a new instance of CDash 3.2.1. I managed to install CDash on the new server via docker, I have a full sql dump of the old CDash installation database done with pgdump. I’m now kinda stuck as to how to preceed with importing the dump in the new installation… Any help would be very welcomed.
All the best