Update Docker configuration for production

Dockerfile

@@ -1,10 +1,33 @@
-FROM node:18-alpine
+# Build stage
+FROM node:18-alpine AS builder
 WORKDIR /app
-COPY package.json package-lock.json ./
+COPY package*.json ./
 RUN npm install
 COPY . .
+RUN npm run build
+
+# Production stage
+FROM node:18-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy necessary files
+COPY --from=builder /app/next.config.js ./
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+USER nextjs
+
 EXPOSE 3000
-CMD ["npm", "run", "dev"]
+ENV PORT 3000
+ENV HOSTNAME "0.0.0.0"
+
+CMD ["node", "server.js"]
 
 # Hinweis:
 # Bei Next.js übernimmt Node.js den Webserver für die Auslieferung der Seiten.

next.config.js

@@ -1,5 +1,6 @@
 module.exports = {
   reactStrictMode: true,
+  output: 'standalone',
   images: {
     domains: ['images.unsplash.com', 'localhost'],
   },