POC GORM fix up + no more digest

[0sewa0]

Description

Initial change: We no longer need to use the digest to pull the image in case of CodeModulesImage, so now we just use the ref we get from the user, and use that string (base64 encoded) as the folder name.

To make the change actually work: (this is the POC part) I had to update the way we do things all around the new GORM implementation, nothing major, but utilising the data in the new database schema in a way that "make more sense".

How can this be tested?

Play around with the csi-driver, check that the CodeModulesImage works, check that there are no database errors in the logs. etc.