Connected accounts
Link or unlink Google and GitHub so you can sign in with either.
On your profile, under Connected Accounts, you can connect or disconnect Google and GitHub. Once connected, you can sign in with that provider.
For security, GitHub won't auto-link to an existing account. To connect it, sign in first and link it here.
Disconnecting
You can disconnect a provider any time — but you can't remove your only sign-in method. Set a password or link another account first.