Dockerfile

FROM python:3.11-slim

# psycopg2-binary needs no build deps; keep image lean.
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1 \
    HF_HOME=/home/appuser/.cache/huggingface \
    SENTENCE_TRANSFORMERS_HOME=/home/appuser/.cache/huggingface

# HF Spaces runs as uid 1000.
RUN useradd -m -u 1000 appuser

WORKDIR /app

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Pre-download the bge model at build time -> fast cold start, writable cache.
RUN mkdir -p $HF_HOME && \
    python -c "from sentence_transformers import SentenceTransformer; SentenceTransformer('BAAI/bge-small-en-v1.5')" && \
    chown -R appuser:appuser /home/appuser/.cache

COPY --chown=appuser:appuser . .

USER appuser

EXPOSE 7860

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]