Update Dockerfile

Dockerfile

@@ -2,13 +2,23 @@ FROM python:3.9-slim
 
 WORKDIR /app
 
-RUN apt-get update && apt-get install -y curl
+# Set up proper permissions and dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/* && \
+    mkdir -p /data && \
+    chmod 777 /data && \
+    useradd -m appuser && \
+    chown appuser:appuser /data
+
+USER appuser
 
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY app.py config.yaml ./
 
-VOLUME /data
+# Set matplotlib config directory
+ENV MPLCONFIGDIR=/tmp/matplotlib
 
 CMD ["python", "app.py"]