Dockerfile

FROM python:3.11-slim          # 3.13.5 does not exist yet on Docker Hub

WORKDIR /app

# system packages needed to build some Python wheels
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# copy dependency list first (Docker layer cache)
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# download NLTK data **after** nltk is installed
COPY nltk_data /app/nltk_data
ENV NLTK_DATA=/app/nltk_data

# copy application code
COPY app.py rag_engine.py ./

EXPOSE 7860

CMD ["python", "app.py", "--server_name=0.0.0.0", "--server_port=7860"]