Dockerfile

FROM node:lts-alpine@sha256:b64ced2e7cd0a4816699fe308ce6e8a08ccba463c757c00c14cd372e3d2c763e AS base

# Install dependencies only when needed
FROM base AS deps

RUN apk add --no-cache libc6-compat

WORKDIR /app

COPY package.json .
COPY package-lock.json .

RUN npm pkg delete scripts.prepare
RUN npm ci

FROM base AS builder

WORKDIR /app

COPY --from=deps /app/node_modules ./node_modules
COPY . .

RUN sed -i "s/output: undefined/output: 'standalone'/" ./next.config.js
RUN npm run build

FROM base AS runner

WORKDIR /app

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

COPY --from=builder /app/public ./public

# Set the correct permission for prerender cache
RUN mkdir .next
RUN chown nextjs:nodejs .next

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

# server.js is created by next build from the standalone output
# https://nextjs.org/docs/pages/api-reference/next-config-js/output
CMD ["node", "server.js"]