Then you don’t NEED code signing but if you dont have it, customers (assuming you are selling) won’t be able to open your app in many cases.
If you aren’t selling, or you are happy to tell people how to turn off gatekeeper temporarily, then you dont need a certification.
But if you are selling, you won’t sell much without it.
Open an Apple developer account, pay the fee, get some certificates from them, buy App Wrapper, and use it to sign your app