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backend/Dockerfile

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+FROM node:22-alpine AS deps
+
+WORKDIR /app
+
+COPY package.json package.json
+COPY tsconfig.json tsconfig.json
+RUN npm install
+
+FROM node:22-alpine AS build
+
+WORKDIR /app
+
+COPY --from=deps /app/node_modules node_modules
+COPY package.json package.json
+COPY tsconfig.json tsconfig.json
+COPY src src
+RUN npm run build
+
+FROM node:22-alpine AS runtime
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+COPY package.json package.json
+RUN npm install --omit=dev && npm cache clean --force
+
+COPY --from=build /app/dist dist
+
+USER node
+
+EXPOSE 4000
+
+CMD ["npm", "run", "start"]