Dockerfile

# Stage 1: Builder
FROM node:20-alpine AS builder

WORKDIR /app

# 👇 Accept build-time variable
ARG NEXT_PUBLIC_API_URL
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL

COPY package.json package-lock.json* ./
RUN npm ci

COPY . .
RUN npm run build


# Stage 2: Runner
FROM node:20-alpine AS runner

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

WORKDIR /app

COPY --from=builder /app/public ./public
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

RUN chown -R nextjs:nodejs /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

USER nextjs

EXPOSE 3000

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