Add files field to packages (#7104)

Author: bluwy

packages/integrations/node/package.json

@@ -23,6 +23,9 @@
     "./preview.js": "./dist/preview.js",
     "./package.json": "./package.json"
   },
+  "files": [
+    "dist"
+  ],
   "scripts": {
     "build": "astro-scripts build \"src/**/*.ts\" && tsc",
     "build:ci": "astro-scripts build \"src/**/*.ts\"",