Update: use port 80 with serve package

Dockerfile

@@ -10,5 +10,5 @@ WORKDIR /app
 COPY package*.json ./
 RUN npm ci --production
 COPY --from=builder /app/dist ./dist
-EXPOSE 4321
-CMD ["npx", "astro", "preview", "--host", "0.0.0.0", "--port", "4321"]
+EXPOSE 80
+CMD ["npx", "serve", "dist", "-l", "80"]

package.json

@@ -11,6 +11,7 @@
   "dependencies": {
     "@tailwindcss/vite": "^4.2.1",
     "astro": "^5.17.1",
+    "serve": "^14.2.5",
     "tailwindcss": "^4.2.1"
   }
 }