message: Add configuration for github enterprise
diff: @@ -136,11 +136,17 @@ export function createGithubProvider(
  const appOrigin = envConfig.getString('appOrigin');
  const clientID = envConfig.getString('clientId');
  const clientSecret = envConfig.getString('clientSecret');
  + const authorizationURL = envConfig.getOptionalString('authorizationURL');
  + const tokenURL = envConfig.getOptionalString('tokenURL');
  + const userProfileURL = envConfig.getOptionalString('userProfileURL');
  const callbackURL = `${baseUrl}/${providerId}/handler/frame?env=${env}`;
  const opts = {
  clientID,
  clientSecret,
  + authorizationURL,
  + tokenURL,
  + userProfileURL,
  callbackURL,
  };
  