Dockerfile

# Stage 1: Install dependencies
FROM node:20-alpine AS deps

RUN corepack enable pnpm

WORKDIR /app

COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile

# Stage 2: Build
FROM node:20-alpine AS builder

RUN corepack enable pnpm

WORKDIR /app

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

# Next.js bakes NEXT_PUBLIC_* vars at build time
ARG NEXT_PUBLIC_SUPABASE_URL
ARG NEXT_PUBLIC_SUPABASE_ANON_KEY
ARG NEXT_PUBLIC_API_URL
ARG NEXT_PUBLIC_WS_URL
ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=$NEXT_PUBLIC_SUPABASE_ANON_KEY
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
ENV NEXT_PUBLIC_WS_URL=$NEXT_PUBLIC_WS_URL
ENV NEXT_TELEMETRY_DISABLED=1

RUN pnpm build

# Stage 3: Production runner
FROM node:20-alpine AS runner

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

WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

COPY --from=builder /app/public ./public
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
ENV HOSTNAME="0.0.0.0"

HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=5 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:3000/ || exit 1

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