Adding permissions within Dockerfile

Dockerfile

@@ -1,4 +1,3 @@
-# Use official lightweight Python image
 FROM python:3.9-slim
 
 # Set working directory
@@ -18,15 +17,21 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy project files
 COPY . .
 
-# Copy Streamlit config to home directory (ensures theme & styling work)
-RUN mkdir -p /root/.streamlit \
- && cp -r .streamlit/* /root/.streamlit/ \
- && chmod 600 /root/.streamlit/config.toml
+# Create writable config/cache dirs
+RUN mkdir -p /app/.streamlit /app/.config/matplotlib
 
-# Expose Streamlit port
+# Copy Streamlit config to writable location
+COPY .streamlit/config.toml /app/.streamlit/config.toml
+
+# Set environment variables so Streamlit & Matplotlib use writable dirs
+ENV STREAMLIT_CONFIG_PATH=/app/.streamlit/config.toml \
+    STREAMLIT_RUNTIME_DIR=/app/.streamlit \
+    MPLCONFIGDIR=/app/.config/matplotlib
+
+# Expose port for Streamlit
 EXPOSE 8501
 
-# Healthcheck for Hugging Face Spaces
+# Healthcheck
 HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health || exit 1
 
 # Run Streamlit