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Dockerfile

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+# ── Stage 1: Abhängigkeiten installieren ─────────────────────────────────────
+FROM node:22-alpine AS deps
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci --omit=dev --ignore-scripts
+
+# ── Stage 2: Build ────────────────────────────────────────────────────────────
+FROM node:22-alpine AS builder
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci --ignore-scripts
+
+COPY . .
+
+# Standalone-Output aktiviert kleinste Images
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+# ── Stage 3: Produktions-Image ────────────────────────────────────────────────
+FROM node:22-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+
+# Unprivilegierter User
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser  --system --uid 1001 nextjs
+
+# Standalone-Bundle + statische Assets kopieren
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static    ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/public          ./public
+
+USER nextjs
+
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
+
+CMD ["node", "server.js"]