final stage of the app

Dockerfile

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+# Use Python 3.11 slim image
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    libjpeg-dev \
+    zlib1g-dev \
+    libfreetype6-dev \
+    liblcms2-dev \
+    libopenjp2-7-dev \
+    libtiff5-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY main.py .
+COPY app/ ./app/
+
+# Create necessary directories
+RUN mkdir -p app/static/qr_codes app/static/logos flask_session
+
+# Set environment variables
+ENV FLASK_APP=main.py
+ENV FLASK_ENV=production
+ENV PYTHONUNBUFFERED=1
+
+# Create non-root user for security
+RUN useradd --create-home --shell /bin/bash app && \
+    chown -R app:app /app
+USER app
+
+# Expose port
+EXPOSE 5000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import requests; requests.get('http://localhost:5000/health')" || exit 1
+
+# Run the application
+CMD ["python", "main.py"]