Dockerfile

# syntax=docker/dockerfile:1
FROM oven/bun:1.3 AS base

# Install dependencies only when needed
FROM base AS deps
WORKDIR /app

# Copy package files
COPY package.json bun.lock ./

# Install dependencies with cache mount for faster rebuilds
RUN --mount=type=cache,target=/root/.bun/install/cache \
    bun install --frozen-lockfile

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

# Generate contentlayer files first, then build Next.js
RUN bunx contentlayer2 build && bun run build

# Production image, copy all the files and run next
FROM oven/bun:1.3-slim AS runner
WORKDIR /app

ENV NODE_ENV=production
# Next.js telemetry
ENV NEXT_TELEMETRY_DISABLED=1

RUN groupadd --system --gid 1001 nodejs && \
    useradd --system --uid 1001 --gid nodejs nextjs

# Copy public with the correct ownership
COPY --from=builder --chown=nextjs:nodejs /app/public ./public

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

# 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

USER nextjs

EXPOSE 3000

ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Add healthcheck using bun (curl not available in slim image)
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
    CMD bun -e "fetch('http://localhost:3000/').then(r => process.exit(r.ok ? 0 : 1)).catch(() => process.exit(1))"

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