Fix URL for staging stack (#7030)

Author: chuckbutkus

frontend/src/utils/generate-github-auth-url.ts

@@ -10,7 +10,7 @@ export const generateGitHubAuthUrl = (clientId: string, requestUrl: URL) => {
     .replace("https://", "")
     .replace("http://", "");
   const authUrl = baseUrl
-    .replace(/(^|\.)staging\.all-hands\.dev$/, ".auth.staging.all-hands.dev")
+    .replace(/(^|\.)staging\.all-hands\.dev$/, "$1auth.staging.all-hands.dev")
     .replace(/(^|\.)app\.all-hands\.dev$/, "auth.app.all-hands.dev");
   const scope = "openid email profile";
   return `https://${authUrl}/realms/allhands/protocol/openid-connect/auth?client_id=github&response_type=code&redirect_uri=${encodeURIComponent(redirectUri)}&scope=${encodeURIComponent(scope)}`;