chore: adds docker files

backend/Dockerfile

@@ -0,0 +1,20 @@
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY tsconfig*.json ./
+COPY src ./src
+RUN npm run build
+
+FROM node:20-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=deps /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+COPY package.json ./
+EXPOSE 3000
+CMD ["npm","run","start"]