Bring back NEXT_PUBLIC_BASE_URL

src/app/sitemap.ts

@@ -1,14 +1,13 @@
+import { env } from '@/lib/env'
 import { MetadataRoute } from 'next'
 
 export default function sitemap(): MetadataRoute.Sitemap {
-  return process.env.VERCEL_URL
-    ? [
-        {
-          url: process.env.VERCEL_URL,
-          lastModified: new Date(),
-          changeFrequency: 'yearly',
-          priority: 1,
-        },
-      ]
-    : []
+  return [
+    {
+      url: env.NEXT_PUBLIC_BASE_URL,
+      lastModified: new Date(),
+      changeFrequency: 'yearly',
+      priority: 1,
+    },
+  ]
 }