/etc/pki/rpm-gpg/ISV-Container-signing-key is missing in OpenShift Container Platform 4.13 and later

Issue

• We have Container image signatures configured and found that with OpenShift 4.13 and later version, verification of 3rd party container is failing because /etc/pki/rpm-gpg/ISV-Container-signing-key is missing on the RHCOS system. Previously in OpenShift Container Platform 4.12 and before, /etc/pki/rpm-gpg/ISV-Container-signing-key was there and available and hence verification of the Images was working as expected.
• While /etc/pki/rpm-gpg/ISV-Container-signing-key is available in Red Hat Enterprise Linux 8 it was found that the key is missing in Red Hat Enterprise Linux 9, causing container image verification to fail
• Why is /etc/pki/rpm-gpg/ISV-Container-signing-key missing in Red Hat Enterprise Linux 9