Dockerfile

# --- Stage 1: Install dependencies ---
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci --ignore-scripts && npm rebuild better-sqlite3

# --- Stage 2: Build ---
FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# --- Stage 3: Production ---
FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV DB_PATH=/app/data/polyworld.db

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

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

# Create data directory for SQLite
RUN mkdir -p /app/data && chown -R nextjs:nodejs /app/data

VOLUME ["/app/data"]

USER nextjs
EXPOSE 3000
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
  CMD wget -qO- http://localhost:3000/api/health || exit 1

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