docker: подготовка к запуску в контейнере (Next.js)

- Dockerfile: multi-stage (deps/build/runner), standalone-сборка, non-root user
- next.config.mjs: output: 'standalone'
- docker-compose.yml: порт 3000, env из .env.local
- .dockerignore: node_modules, .next, .env*, кэш
- проверено: npm run build прошёл, standalone артефакт на месте

Dockerfile

@@ -0,0 +1,33 @@
+# ---- deps ----
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --no-audit --no-fund
+
+# ---- build ----
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN npm run build
+
+# ---- runtime ----
+FROM node:20-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production \
+    NEXT_TELEMETRY_DISABLED=1 \
+    PORT=3000 \
+    HOSTNAME=0.0.0.0
+
+RUN addgroup -S nodejs && adduser -S nextjs -G nodejs
+
+COPY --from=build --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=build --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=build --chown=nextjs:nodejs /app/public ./public
+
+USER nextjs
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]