I had tried uploaded dmg to github (free hosting) and using github actions for the signing and notarization. Plus update4j for the automatic updates. All worked fine except for the notarization, never cracked this one.
Apologies for how much junk is in here[0], I finally figured out notarization and then lost the will to touch it. I'm planning on circling back to clean it up in a few weeks when that entire pile of stress is a bit more of a distant memory, but hopefully it's helpful? =)...
