initial

Dockerfile

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+# Multi-arch (ARM64 / AMD64) — works on Pi5 + Pi4
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY src/ ./src/
+
+EXPOSE 3000
+
+USER node
+
+CMD ["node", "src/server.js"]