fix: update Dockerfile to fix permissions for watermarked images directory

Dockerfile

@@ -4,12 +4,13 @@ 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
 
+# Create the directory and set permissions
+RUN mkdir -p /app/static/watermarked_images && \
+    chmod 777 /app/static/watermarked_images
+
 # Install the dependencies
 RUN pip install --no-cache-dir -r requirements.txt