Dockerfile

# Use mirror.gcr.io to avoid Docker Hub date issues
FROM mirror.gcr.io/library/python:3.10-slim AS builder

# Install system dependencies for Python packages (e.g., sentence-transformers)
RUN apt-get update && apt-get install -y \
    gcc g++ make \
    libblas-dev liblapack-dev \
    && rm -rf /var/lib/apt/lists/*

# Set working directory
WORKDIR /polysensor

# Copy requirements first for better caching
COPY requirements.txt .

# Install Python dependencies in virtual environment
RUN python -m venv /opt/venv && \
    /opt/venv/bin/pip install --upgrade pip && \
    /opt/venv/bin/pip install --no-cache-dir -r requirements.txt

# Runtime stage
FROM mirror.gcr.io/library/python:3.10-slim

# Install curl for health check
RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN useradd -r appuser

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv

# Set PATH
ENV PATH="/opt/venv/bin:$PATH"

# Set working directory
WORKDIR /polysensor

# Copy application code
COPY . .

# Change ownership to non-root user
RUN chown -R appuser:appuser /polysensor

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 5000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:5000/health || exit 1

# Run application
CMD ["python", "main.py"]