docker image and build action

Dockerfile

@@ -0,0 +1,18 @@
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+# Runtime stage: serve the built app with Express
+FROM node:22-alpine
+WORKDIR /app
+ENV NODE_ENV=production
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+COPY server.js ./
+COPY --from=build /app/dist ./dist
+EXPOSE 3000
+USER node
+CMD ["node", "server.js"]