Add Dockerfile

Dockerfile

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+# ---- 1) Install deps (cached) ----------------------------------------------
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+
+# ---- 2) Build the Next.js app ----------------------------------------------
+FROM node:20-alpine AS builder
+WORKDIR /app
+ENV NEXT_TELEMETRY_DISABLED=1
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN npm run build
+
+# ---- 3) Runtime: copy standalone output, run as non-root -------------------
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+# Environment
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3000
+
+# Non-root user
+RUN addgroup -g 1001 -S nodejs && adduser -S nextjs -u 1001
+
+# Copy only what's needed to run the server
+# - .next/standalone includes server.js and minimal node_modules
+# - .next/static and public are needed for assets
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+# Expose Next.js port
+EXPOSE 3000
+
+USER 1001
+CMD ["node", "server.js"]