GitHub has added support for securing SSH Git operations using FIDO2 security keys for added protection from account takeover attempts.

When you add a security key to SSH operations, you can use these devices to protect you and your account from accidental exposure, account hijacking, or malware, GitHub security engineer Kevin Jones ...

For instance, it also rotated its GitHub.com private SSH key last March after it was accidentally and "briefly" exposed via a public GitHub repository, impacting Git operations over SSH using RSA.