rearrange: add dockerfile

Dockerfile

@@ -0,0 +1,30 @@
+### Builder stage: install deps and generate Prisma clients
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+COPY package*.json package-lock.json ./
+COPY prisma ./prisma
+
+RUN npm ci
+
+COPY . .
+
+### Production stage: smaller runtime image
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+RUN addgroup -S app && adduser -S app -G app
+
+COPY --from=builder /app/app ./app
+COPY --from=builder /app/prisma ./prisma
+COPY --from=builder /app/index.js ./index.js
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/package*.json ./
+
+RUN chown -R app:app /app/prisma
+
+USER app
+
+EXPOSE 3000
+
+CMD ["node", "index.js"]