test(waas-engine): add vitest suite and node ssr container adapter setup

astro.config.mjs

@@ -1,11 +1,13 @@
-// @ts-check
 import { defineConfig } from 'astro/config';
-
 import tailwind from '@astrojs/tailwind';
-
 import react from '@astrojs/react';
+import node from '@astrojs/node';
 
 // https://astro.build/config
 export default defineConfig({
+  output: 'server',
+  adapter: node({
+    mode: 'standalone'
+  }),
   integrations: [tailwind(), react()]
 });