feat: configure Vercel Cron for 30-minute polling interval and update default poll duration

Author: Prayag2003

tracker.js

@@ -12,7 +12,7 @@ const {
   GITHUB_USERNAME,
   RESEND_API_KEY,
   NOTIFY_EMAIL,
-  POLL_INTERVAL_MS = "120000",
+  POLL_INTERVAL_MS = "1800000",
 } = process.env;
 
 if (!GITHUB_USERNAME || !RESEND_API_KEY || !NOTIFY_EMAIL) {

vercel.json

@@ -0,0 +1,15 @@
+{
+  "version": 2,
+  "rewrites": [
+    {
+      "source": "/(.*)",
+      "destination": "/tracker.js"
+    }
+  ],
+  "crons": [
+    {
+      "path": "/trigger-poll",
+      "schedule": "*/30 * * * *"
+    }
+  ]
+}