GithHubSignIn Completo

gitHubSignInFull.dart

final GitHubSignIn gitHubSignIn = GitHubSignIn(
      clientId: "",
      clientSecret:
          "",
      redirectUrl:
          "");
  var result = await gitHubSignIn.signIn(context);
  switch (result.status) {
    case GitHubSignInResultStatus.ok:
      final AuthCredential credential =
          GithubAuthProvider.getCredential(
        token: result.token,
      );

      final FirebaseUser user = await FirebaseAuth.instance
          .signInWithCredential(credential);

      _onSuccess();
      model.signUpGoogle(user); //deve enviar para um model, utilizei o mesmo do Login pelo Google
      break;

    case GitHubSignInResultStatus.cancelled:
    case GitHubSignInResultStatus.failed:
      _onFail();
      break;
  }