Dockerfile

FROM node:22-alpine AS deps
WORKDIR /app
# Copy package files to install dependencies
COPY package.json package-lock.json* ./
# Install dependencies (ci ensures exact versions from lockfile)
RUN npm ci

# ... (inside the builder stage)
FROM node:22-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# 1. Declare ARGs for Public Variables (Build-time)
ARG NEXT_PUBLIC_SUPABASE_URL
ARG NEXT_PUBLIC_SUPABASE_PUBLISHABLE_OR_ANON_KEY
ARG NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY
ARG NEXT_PUBLIC_BASE_URL

# 2. Map them to ENV so Next.js embeds them in the JS bundles
ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
ENV NEXT_PUBLIC_SUPABASE_PUBLISHABLE_OR_ANON_KEY=$NEXT_PUBLIC_SUPABASE_PUBLISHABLE_OR_ANON_KEY
ENV NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY=$NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY
ENV NEXT_PUBLIC_BASE_URL=$NEXT_PUBLIC_BASE_URL

RUN npm run build

# ... (rest of the runner stage)

FROM node:22-alpine 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



# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
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

# Start the server
CMD ["node", "server.js"]