Fix: Add directory permissions to Dockerfile

Dockerfile

@@ -12,6 +12,10 @@ COPY requirements.txt .
 # -r requirements.txt: Specifies the file containing the list of packages to install.
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Create directories for uploads and results, and set permissions
+RUN mkdir -p /app/uploads /app/results && \
+    chmod 777 /app/uploads /app/results
+
 # Copy the rest of the application code into the container at /app
 # This includes app.py, nemaquant.py, templates/, static/, etc.
 COPY . .