Wait, do you need to do that? I've never attempted distribution, but I've created multiple local apps with Electron and Tauri for myself, and they are just a .app on my Applications folder. Wouldn't it be as easy as sharing this file with anyone else if I wanted to distribute them?
No, macOS treats your machine's self-signed certificates in a special way so that running apps signed with them is transparent to you, but a nightmare to anyone you dare to distribute the apps to without Apple's approval.
They need to try to open it, visit Settings > Privacy & Security, scroll down quite a bit, hit Open Anyway, try to open it again, and confirm one last time.
(Might be quicker for some in Terminal if supported.)
I think it used to be Right Click > Open, then confirm.