Dockerfile

# ============================================
# Stage 1: Dependencies
# ============================================
FROM node:20-alpine AS deps
# Install security updates and required packages
RUN apk update && apk upgrade && \
    apk add --no-cache libc6-compat && \
    rm -rf /var/cache/apk/*

# Install pnpm globally
RUN corepack enable && corepack prepare pnpm@latest --activate

WORKDIR /app

# Copy package files for dependency installation
COPY package.json pnpm-lock.yaml* ./

# Install dependencies with frozen lockfile
RUN pnpm install --frozen-lockfile --prod=false

# ============================================
# Stage 2: Builder
# ============================================
FROM node:20-alpine AS builder
# Install security updates
RUN apk update && apk upgrade && \
    rm -rf /var/cache/apk/*

# Install pnpm globally
RUN corepack enable && corepack prepare pnpm@latest --activate

WORKDIR /app

# Copy dependencies from deps stage
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Set build-time environment variables
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production

# Build the application
RUN pnpm build

# ============================================
# Stage 3: Runner (Production)
# ============================================
FROM node:20-alpine AS runner
# Install security updates and required runtime dependencies
RUN apk update && apk upgrade && \
    apk add --no-cache \
    tzdata \
    && rm -rf /var/cache/apk/*

# Create non-root user for security
RUN addgroup --system --gid 1001 nodejs && \
    adduser --system --uid 1001 nextjs

WORKDIR /app

# Set production environment
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# Copy necessary files from builder
# Next.js standalone output includes everything needed in .next/standalone
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

# Switch to non-root user
USER nextjs

# Expose port
EXPOSE 3000

# Set timezone
ENV TZ=UTC
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Health check - uses dedicated health endpoint
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
    CMD node -e "require('http').get('http://localhost:3000/api/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})" || exit 1

# Start the application
# Next.js standalone creates server.js in the root of standalone output
CMD ["node", "server.js"]