Update Dockerfile

Dockerfile

@@ -2,27 +2,38 @@ FROM python:3.9-slim
 
 WORKDIR /app
 
+# Create a non-root user
+RUN useradd -m appuser
+
 # Install system dependencies
 RUN apt-get update && apt-get install -y \
     build-essential \
     git \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy requirements file
-COPY requirements.txt .
+# Create directories for matplotlib and set appropriate permissions
+RUN mkdir -p /home/appuser/.config/matplotlib && \
+    chown -R appuser:appuser /home/appuser/.config
 
-# Install Python dependencies
+# Copy requirements first for better caching
+COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application files
 COPY app.py .
 COPY utils.py .
 
-# Environment variables will be set in the Hugging Face Space UI
-# OPENAI_API_KEY should be added as a secret
+# Set ownership of application files
+RUN chown -R appuser:appuser /app
+
+# Set environment variable for matplotlib
+ENV MPLCONFIGDIR=/home/appuser/.config/matplotlib
 
 # Expose port for the application
 EXPOSE 7860
 
+# Switch to the non-root user
+USER appuser
+
 # Command to run the application
 CMD ["python", "app.py"]