Update Dockerfile

Dockerfile

@@ -4,13 +4,15 @@ WORKDIR /app
 
 COPY . /app
 
-# Create all necessary directories with universal permissions
+# Create necessary directories and set permissions only for what we need
 RUN mkdir -p /app/output && \
     mkdir -p /app/matplotlib && \
     mkdir -p /app/ipython && \
     mkdir -p /app/kernels && \
-    chmod -R 777 /app && \
-    chmod -R 777 /
+    chmod -R 777 /app/output && \
+    chmod -R 777 /app/matplotlib && \
+    chmod -R 777 /app/ipython && \
+    chmod -R 777 /app/kernels
 
 # Set environment variables
 ENV MPLCONFIGDIR=/app/matplotlib