Fix Dockerfile.cpu mount check logic in ubi9-python-3.12 runtime

Author: jiridanek

runtimes/minimal/ubi9-python-3.12/Dockerfile.cpu

@@ -13,7 +13,7 @@ WORKDIR /opt/app-root/bin
 # OS Packages needs to be installed as root
 USER 0
 
-RUN ls /mnt && false
+RUN ls /mnt && true
 
 # Inject the official UBI 9 repository configuration into the AIPCC base image.
 # The Quay-based AIPCC image is "repo-less" by default (https://gitlab.com/redhat/rhel-ai/core/base-images/app#repositories), so dnf cannot upgrade or install packages.