Multi-Stage Dockerfile Generator (Node, Go, Python, Rust)

# =========================================================================# Multi-Stage Dockerfile: Next.js Standalone (Hardened & Layer-Cached)# Generated by ToolsAA Multi-Stage Dockerfile Generator# =========================================================================# syntax=docker/dockerfile:1.6
# -------------------------------------------------------------------------# Stage 1: Dependencies Resolution# -------------------------------------------------------------------------FROM node:22-alpine AS depsWORKDIR /app
# Install libc6-compat if Alpine (required for some Node native extensions)RUN apk add --no-cache libc6-compat
# Install package manager lockfiles first to leverage layer cachingCOPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* bun.lockb* ./RUN --mount=type=cache,target=/root/.npm \    if [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm install --frozen-lockfile; \    elif [ -f yarn.lock ]; then yarn --frozen-lockfile; \    elif [ -f bun.lockb ]; then npm install -g bun && bun install --frozen-lockfile; \    else npm ci; fi
# -------------------------------------------------------------------------# Stage 2: Application Builder# -------------------------------------------------------------------------FROM node:22-alpine AS builderWORKDIR /app
COPY --from=deps /app/node_modules ./node_modulesCOPY . .
# Disable Next.js telemetry during compilationENV NEXT_TELEMETRY_DISABLED=1ENV NODE_ENV=production
RUN --mount=type=cache,target=/app/.next/cache \    if [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm run build; \    elif [ -f yarn.lock ]; then yarn build; \    else npm run build; fi
# -------------------------------------------------------------------------# Stage 3: Production Minimal Runner# -------------------------------------------------------------------------FROM node:22-alpine AS runnerWORKDIR /app
ENV NODE_ENV=production \    PORT=3000 \    NEXT_TELEMETRY_DISABLED=1ENV NODE_ENV=productionENV PORT=3000ENV HOSTNAME="0.0.0.0"
# Security: Create unprivileged system group and userRUN addgroup -g 10001 -S nodejs && \    adduser -u 10001 -S -G nodejs nextjs# Copy public static assets and standalone bundleCOPY --from=builder /app/public ./publicCOPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \  CMD wget --no-verbose --tries=1 --spider http://127.0.0.1:3000/api/health || exit 1EXPOSE 3000
USER nextjsCMD ["node", "server.js"]