add backend hatchet worker for calendar predue sync

backend_worker/Dockerfile

@@ -0,0 +1,13 @@
+FROM node:22-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY src ./src
+COPY tsconfig.json ./tsconfig.json
+
+ENV NODE_ENV=production
+
+CMD ["npm", "run", "start"]