The problem is the naming, which is a pretty random xxx digit and sometimes the date, so you would have to check 999 possible links only to find out that there is no update? Currently I know no better option, maybe using the F-Droid API like all the Android stores do would work well.
From Github releases
This is easier, because https://github.com/creator/app/releases/latest is an alias to the latest tag. Somehow it is possible to get the tag UR