serving built app on port 3000 when starting with fastify

this eases up scalingo deployment

website/package.json

@@ -5,7 +5,7 @@
   "version": "0.1.0",
   "scripts": {
     "dev": "astro dev",
-    "start": "astro dev",
+    "start": "node ./server.mjs",
     "build-backgrounds": "node ./bin/build-services-backgrounds.mjs",
     "build": "astro check && npm run build-backgrounds && astro build",
     "copy-logos": "cp -r ./node_modules/@gouvfr-lasuite/integration/dist/logos/* ./src/assets/logos",
@@ -18,11 +18,13 @@
     "@astrojs/markdown-remark": "^5.1.0",
     "@astrojs/react": "^3.3.1",
     "@astrojs/starlight": "^0.21.5",
+    "@fastify/static": "^7.0.3",
     "@gouvfr-lasuite/integration": "^0.1.0",
     "@types/react": "^18.3.1",
     "@types/react-dom": "^18.3.0",
     "@types/react-syntax-highlighter": "^15.5.11",
     "astro": "^4.3.5",
+    "fastify": "^4.26.2",
     "prettier": "^3.2.5",
     "prettier-plugin-astro": "^0.13.0",
     "prismjs": "^1.29.0",

website/server.mjs

@@ -0,0 +1,17 @@
+import { join } from "path"
+import Fastify from "fastify"
+import staticMiddleware from "@fastify/static"
+const fastify = Fastify({
+  logger: true,
+})
+
+fastify.register(staticMiddleware, {
+  root: join(import.meta.dirname, process.env.STATIC_DIR || "dist"),
+})
+
+try {
+  fastify.listen({ port: process.env.PORT || 3000 })
+} catch (err) {
+  fastify.log.error(err)
+  process.exit(1)
+}