Add Dockerfile for running FastAPI backend and React frontend in a single HF Space container

Dockerfile

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+# Dockerfile
+
+# Base image to use
+FROM tiangolo/uvicorn-gunicorn-fastapi:python3.8
+
+# Set the working directory to /app
+WORKDIR /app
+
+# Copy the backend application files
+COPY ./backend /app/backend
+
+# Copy the frontend application files
+COPY ./frontend /app/frontend
+
+# Install dependencies for the backend
+RUN pip install --no-cache-dir -r /app/backend/requirements.txt
+
+# Set the environment variables for FastAPI
+ENV MODULE_NAME=backend.main:app
+
+# Expose port 80 for the FastAPI app
+EXPOSE 80
+
+# Install Node.js for frontend
+RUN apt-get update && apt-get install -y nodejs npm
+
+# Build the React frontend
+RUN cd frontend && npm install && npm run build
+
+# Serve the React app
+RUN cp -R frontend/build /app/frontend/build
+
+# Start the FastAPI app
+CMD uvicorn backend.main:app --host 0.0.0.0 --port 80 --reload