Qubes-dom0-cached RPM security policy

Does anyone happen to know how I can modify the configuration for the qubes-dom0-cached repo? I am trying to install a local RPM package for displaylink but I get an error regarding the GPG signature check as per active RPM security policy. I tried setting the gpgcheck to zero in /etc/dnf/dnf.com and also for all the repos in /etc/yum.repos.d/qubes-dom0.repo but it hasn’t helped.
I also get the same error if I try doing ‘sudo qubes-dom0-update qubes-manager’.

Many Thanks.