fix: replace CMD with RUN command to list files in Dockerfile

Dockerfile

@@ -56,7 +56,7 @@ RUN sudo apt update -y && sudo apt upgrade -y && \
 # Install Python dependencies from requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
 WORKDIR $HOME/app
-CMD ["ls -a"]
+RUN ls
 
 # Expose the port for the app
 EXPOSE 7860