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Dockerfile

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+# syntax=docker/dockerfile:1.7
+
+# ─── Stage 1: install deps (cacheable) ──────────────────────────────────────
+FROM node:22-alpine AS deps
+WORKDIR /app
+# libc6-compat helps some native deps (bcryptjs is pure JS so not strictly
+# needed, but cheap insurance for pg / future native deps).
+RUN apk add --no-cache libc6-compat
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# ─── Stage 2: build ──────────────────────────────────────────────────────────
+FROM node:22-alpine AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# next.config.ts has `output: "standalone"`, which writes a minimal Node
+# server bundle to .next/standalone — used by the runtime stage below.
+RUN npm run build
+
+# ─── Stage 3: runtime ────────────────────────────────────────────────────────
+FROM node:22-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production \
+    PORT=3000 \
+    HOSTNAME=0.0.0.0 \
+    NEXT_TELEMETRY_DISABLED=1
+
+# Non-root user for the app process.
+RUN addgroup --system --gid 1001 nodejs \
+ && adduser --system --uid 1001 --ingroup nodejs nextjs
+
+# Standalone output bundles only the files needed to run the server, plus a
+# trimmed node_modules. Public assets and .next/static are still external.
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+EXPOSE 3000
+
+# server.js is generated by Next's standalone output; it reads PORT/HOSTNAME
+# from the environment at startup, so docker compose can inject them.
+CMD ["node", "server.js"]