Ch16.4 - OPA Gatekeeper deployment broken

[jannes]

Something about the Gatekeeper deployment seems to be broken,
I am getting the following error when following the exercises and deploying the todo-list/production:

Error from server (InternalError): error when creating "todo-list/production/web.yaml": Internal error occurred: 
failed calling webhook "check-ignore-label.gatekeeper.sh": Post "https://gatekeeper-webhook-service.gatekeeper-
system.svc:443/v1/admitlabel?timeout=5s": x509: certificate relies on legacy Common Name field, 
use SANs or temporarily enable Common Name matching with GODEBUG=x509ignoreCN=0