Way to allow updating without code signing?

Hi,

I'm a young dev and just created an open source electron app. I also want to have the feature to let users know that there is an update for my app. The thing is I dont want spend all these fees just to sign my code. There should be a solution where the user gets informed of a new version of an app and worst case is, that he has to manually download the new version... But else this is a pretty useless solution for a lot of small devs...

greetings!