vercel adapter

astro.config.mjs

@@ -1,5 +1,9 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
 
+import vercel from '@astrojs/vercel';
+
 // https://astro.build/config
-export default defineConfig({});
+export default defineConfig({
+  adapter: vercel()
+});