Dockerfile

# Build stage
FROM python:3.11-slim-bookworm AS builder

# Install system dependencies for building packages
RUN apt-get update && apt-get install -y \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Copy requirements and install Python packages
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Production stage
FROM python:3.11-slim-bookworm

# Install only runtime dependencies
RUN apt-get update && apt-get install -y \
    libsndfile1 \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

# Create non-root user
RUN groupadd --gid 1000 appuser && \
    useradd --uid 1000 --gid 1000 --create-home --shell /bin/bash appuser

# Copy virtual environment from builder stage
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Set working directory
WORKDIR /app

# Copy application code
COPY --chown=appuser:appuser . .

# Switch to non-root user
USER appuser

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD python -c "import tensorflow as tf; print('TensorFlow version:', tf.__version__)" || exit 1

# Default command
CMD ["python", "src/hound_inference.py"]