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https://docs.github.com/en/github/administering-a-repository... contains details for configuring it on a repository basis. Looks like you can require it for new github accounts XOR first time contributors XOR all forks.

It's also configurable at the organisation and enterprise level, if those are relvent to anyone.

Organization settings: https://docs.github.com/en/organizations/managing-organizati... Enterprise settings: https://docs.github.com/en/github/setting-up-and-managing-yo...