Dockerfile

# Use Node.js LTS (20) as the base image
FROM node:20-slim AS base
ENV PNPM_HOME="/pnpm"
ENV PATH="$PNPM_HOME:$PATH"
RUN corepack enable
WORKDIR /app

# Install dependencies only when needed
FROM base AS deps
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile

# Rebuild the source code only when needed
FROM base AS builder
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Build the application
# Note: We don't run lint here to speed up build, assuming CI does it
ENV NEXT_TELEMETRY_DISABLED=1
RUN pnpm build

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# Create a non-root user for security
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Copy public folder
COPY --from=builder /app/public ./public

# Copy model directory explicitly as it's needed for inference
COPY --from=builder /app/model ./model

# Automatically leverage output traces to reduce image size
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Set the correct permission for prerender cache
mkdir .next
chown nextjs:nodejs .next

USER nextjs

EXPOSE 3000

ENV PORT=3000

# server.js is created by next build from the standalone output
CMD ["node", "server.js"]