docker

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# ---- deps: instala dependencias (capa cacheable) ----
+FROM node:22-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# ---- build: compila Next.js en modo standalone ----
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Variables NEXT_PUBLIC_* se incrustan en el bundle del cliente en build-time,
+# por eso llegan como build-arg (desde docker-compose) y no solo como env de
+# runtime del contenedor final.
+ARG NEXT_PUBLIC_API_URL
+ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN npm run build
+
+# ---- runtime: imagen final mínima (next.config.ts tiene output: "standalone") ----
+FROM node:22-alpine AS runtime
+WORKDIR /app
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV PORT=3000
+ENV HOSTNAME=0.0.0.0
+
+RUN addgroup -g 1001 -S nodejs && adduser -S nextjs -u 1001
+USER nextjs
+
+COPY --from=build --chown=nextjs:nodejs /app/public ./public
+COPY --from=build --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=build --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+EXPOSE 3000
+ENTRYPOINT ["node", "server.js"]