Dockerfile

FROM python:3.9-slim-bookworm

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    STREAMLIT_BROWSER_GATHER_USAGE_STATS=false

WORKDIR /app

# system deps (keep minimal; drop build-essential if not building wheels)
RUN apt-get update && apt-get install -y --no-install-recommends \
    curl git ca-certificates \
 && rm -rf /var/lib/apt/lists/*

# python deps (better cache behavior)
COPY requirements.txt .
RUN python -m pip install --upgrade pip \
 && pip install --no-cache-dir --prefer-binary -r requirements.txt

# your code
COPY . .

ENV PORT=7860
EXPOSE 7860

# healthcheck helps detect boot issues
HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
  CMD curl --fail http://127.0.0.1:${PORT}/_stcore/health || exit 1

CMD ["sh", "-c", "streamlit run app.py --server.address=0.0.0.0 --server.port=${PORT}"]