Dear Popleys ,
There should be 2 options,
1. add pkix.useDefaultTrustAnchors cluster wide property and set it to true, to trust the well know certificate authorities (Go daddy should be included)
2. Godaddy should provide the link(s) to download their root certificate, here is godaday cert repository I found from google,
Repository
(option 3, you may ask help from godaddy support.)
Regards,
Mark