Füge Dockerfile hinzu und passe ExpressManager an, um den Frontend-Pfad aus Umgebungsvariablen zu laden

Dockerfile

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+# Use an official Node.js runtime as the base image
+FROM node:18
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json to install dependencies
+COPY backend/package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy backend source files
+COPY backend /app/backend
+
+# Copy frontend files and serve them as static assets
+COPY frontend /app/frontend
+
+# Set environment variable to production
+ENV NODE_ENV=production
+
+# Expose the port the app runs on
+EXPOSE 3000
+
+# Start the application
+CMD ["node", "backend/src/server.js"]