Mock: how to get a client cert + key into the chroot?

Hi,

How do I get a client certificate + key into the mock chroot? Mock needs 
access to a repo which requires the client to send its certificate 
(nginx with ssl_verify_client on;).

If I copy the certificate and key to /etc/pki/tls/{certs,private} in the 
bootstrap directory then the chroot picks them up and the repo is available.

Is there a way to specify the client certificate + key in a config 
somewhere so they get picked up automatically?

Thanks!

Best,
Patrick