Dockerfile

# ── Stage 1: Base ──────────────────────────────────────────────
FROM node:20-alpine AS base
WORKDIR /app

# ── Stage 2: Install dependencies ─────────────────────────────
FROM base AS deps
COPY package.json package-lock.json* ./
RUN npm ci

# ── Stage 3: Build the application ────────────────────────────
FROM base AS builder
COPY --from=deps /app/node_modules ./node_modules
COPY . .

ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

# ── Stage 4: Production runner ────────────────────────────────
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Copy public assets
COPY --from=builder /app/public ./public

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

USER nextjs

EXPOSE 3000
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

CMD ["node", "server.js"]