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Actually, you can create a self-signed certificate authority. I did it to successfully compile a Universal binary for Atari800MacX. You do that using Certificate Authority menu item in Keychain Access.
Unless you want to buy a developer certificate, a self-signed certificate authority should suffice.
Thanks Bob, but with the writing on the wall I decided to sponsor Hatari with $99/year (or 999 SEK as it was) :) I will soon start signing the Hatari builds with a valid distribution cert for macOS.
(For M1 it looks like it will take a little while, I couldn't immediately compile the needed third party libraries for arm64)
regards,
Troed