Dockerfile

# Use official Python runtime as base image
FROM python:3.11-slim-bullseye AS builder

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1

# Install system dependencies
RUN apt-get update && \
    apt-get install -y --no-install-recommends \
    build-essential \
    python3-dev && \
    rm -rf /var/lib/apt/lists/*

# Create and set working directory
WORKDIR /app

# Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# --- Runtime stage ---
FROM python:3.11-slim-bullseye

# Install runtime dependencies
RUN apt-get update && \
      apt-get install -y --no-install-recommends \
      libgomp1 && \
      rm -rf /var/lib/apt/lists/*

# Copy dependencies
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Make sure uvicorn (and any other pip-installed CLI tools) are on the PATH
ENV PATH="/usr/local/bin:${PATH}"

# Create non-root user and app directory
RUN useradd -m appuser && \
      mkdir -p /app && \
      chown -R appuser /app

WORKDIR /app
COPY --chown=appuser . .

USER appuser

EXPOSE 8000

CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]