Dockerfile

# ---- Base ----
FROM node:20-alpine AS base
WORKDIR /app
ENV NEXT_TELEMETRY_DISABLED=1

# ---- Dependencies ----
FROM base AS deps
COPY package.json yarn.lock .yarnrc.yml ./
RUN corepack enable && yarn install --immutable

# ---- Builder ----
FROM base AS builder
RUN corepack enable
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN yarn build

# ---- Runner ----
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV PORT=3000
ENV HOSTNAME=0.0.0.0

# Create non-root user
RUN addgroup --system --gid 1001 nodejs \
    && adduser --system --uid 1001 nextjs

# Copy necessary files from builder
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

CMD ["node", "server.js"]