Fix directory permissions for watermarked_images

Dockerfile

@@ -4,6 +4,9 @@ FROM python:3.10-slim
 # Set the working directory in the container
 WORKDIR /app
 
+# Ensure the necessary directories exist and set proper permissions
+RUN mkdir -p /app/static/watermarked_images && chmod -R 777 /app/static/watermarked_images
+
 # Copy the current directory contents into the container at /app
 COPY . /app