add dockerfile

Dockerfile

@@ -0,0 +1,6 @@
+FROM node:22-alpine
+WORKDIR /app
+COPY . /app
+RUN npm install
+CMD npm run start
+EXPOSE 3000

package.json

@@ -4,6 +4,7 @@
   "description": "my server",
   "main": "index.js",
   "scripts": {
+    "start": "node index.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "",