Dockerfile

# Use Python 3.11 slim image as base
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    FLASK_APP=app.py \
    FLASK_ENV=production

# Set work directory
WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first to leverage Docker cache
COPY requirements.txt .

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

# Copy application code
COPY . .

# Create uploads directory with proper permissions
RUN mkdir -p uploads && \
    chmod 755 uploads

# Create non-root user for security
RUN groupadd -r gpxcheck && \
    useradd -r -g gpxcheck -d /app -s /sbin/nologin gpxcheck && \
    chown -R gpxcheck:gpxcheck /app

# Switch to non-root user
USER gpxcheck

# Expose port 5000
EXPOSE 5000

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

# Run the application
CMD ["python", "app.py"]