Add Dockerfile

Dockerfile

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+# Use official Node.js 20 LTS image
+FROM node:20-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Install dependencies first (better caching)
+COPY package*.json ./
+RUN npm ci --production
+
+# Copy source files (including .next build output if pre-built)
+COPY . .
+
+# If you want to build inside container, uncomment:
+# RUN npm run build
+
+# Use non-root user (optional, but recommended)
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+USER appuser
+
+# Expose port your app listens on
+EXPOSE 3000
+
+# Start your Next.js app (adjust if using custom server)
+CMD ["npm", "start"]