Create monorepo from known-good production state

app/Dockerfile

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+# syntax=docker/dockerfile:1
+
+FROM node:20-bookworm-slim AS deps
+WORKDIR /app
+
+# Install dependencies needed to build
+COPY package.json package-lock.json ./
+RUN npm ci
+
+FROM node:20-bookworm-slim AS build
+WORKDIR /app
+
+# Reuse installed dependencies
+COPY --from=deps /app/node_modules ./node_modules
+
+# Copy app source
+COPY . .
+
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV NODE_ENV=production
+
+# Build the app
+RUN npm run build
+
+# After building, remove dev dependencies so runtime stays smaller
+RUN npm prune --omit=dev
+
+FROM node:20-bookworm-slim AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV HOME=/tmp
+
+# Create writable directories
+RUN mkdir -p /app/files /app/.next/cache /tmp && \
+    chown -R 1000:1000 /app /tmp
+
+# Copy only runtime files
+COPY --from=build --chown=1000:1000 /app/package.json ./package.json
+COPY --from=build --chown=1000:1000 /app/next.config.js ./next.config.js
+COPY --from=build --chown=1000:1000 /app/public ./public
+COPY --from=build --chown=1000:1000 /app/.next ./.next
+COPY --from=build --chown=1000:1000 /app/node_modules ./node_modules
+
+USER 1000:1000
+EXPOSE 3000
+
+CMD ["node", "node_modules/next/dist/bin/next", "start", "-p", "3000", "-H", "0.0.0.0"]