Dockerfile

# Install dependencies only when needed
FROM node:16.14-alpine AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app
COPY package.json yarn.lock ./
# enable yarn berry
RUN corepack enable
RUN yarn install --immutable

# Rebuild the source code only when needed
FROM node:16.14-alpine AS builder
WORKDIR /app
COPY --from=deps /app/.yarn ./.yarn
COPY --from=deps /app/.pnp.cjs /app/.pnp.loader.mjs  ./
COPY . .
ENV NEXT_TELEMETRY_DISABLED 1
# enable yarn berry
RUN corepack enable
RUN yarn build


# Production image, copy all the files and run next
FROM node:16.14-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
# enable yarn berry
RUN corepack enable
# You only need to copy next.config.js if you are NOT using the default configuration
# COPY --from=builder /app/next.config.js ./

# yarn pnp 
COPY --from=builder /app/public ./public
COPY --from=builder /app/package.json ./package.json
COPY --from=builder /app/.pnp.cjs ./.pnp.cjs
COPY --from=builder /app/yarn.lock ./yarn.lock

# next.js standalone output folder 
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

CMD ["node", "-r", "./.pnp.cjs", "server.js"]