Add blank line at end of Dockerfile per review feedback

Co-authored-by: reyang <17327289+reyang@users.noreply.github.com>

Author: Copilot

docker/ubuntu22.04/Dockerfile

@@ -19,4 +19,4 @@ RUN sudo apt-get update
 
 CMD /bin/bash
 
-# ENTRYPOINT bash
+# ENTRYPOINT bash