Dockerfile

FROM node:18-alpine AS base

# Install dependencies only when needed
FROM base AS deps
WORKDIR /app

# Copy package.json and install dependencies
COPY package.json ./
RUN npm install

# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Set proper environment variable for build
ENV NEXT_TELEMETRY_DISABLED 1

# Build the application
RUN npm run build

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV production
ENV NEXT_TELEMETRY_DISABLED 1

# Create a non-root user to run the app
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs
USER nextjs

# Copy necessary files from builder
COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Expose the port the app will run on
EXPOSE 3000

# Set the environment variable for the app
ENV PORT 3000

# Start the app
CMD ["node", "server.js"]