add node

astro.config.mjs

@@ -1,4 +1,11 @@
 import { defineConfig } from 'astro/config';
 
+import node from "@astrojs/node";
+
 // https://astro.build/config
-export default defineConfig({});
+export default defineConfig({
+  output: "server",
+  adapter: node({
+    mode: "standalone"
+  })
+});