Update CA cert to Digicert in test-values.yaml

Big Bang Umbrella Merge Request

Changes:

• Updates the CA cert in tests/test-values.yaml from Let's Encrypt to DigiCert.

Background:

• TLS certs were recently updated, and the issuer changed from Let's Encrypt to Digicert. I recieved TLS errors when testing local Keycloak auth with Kiali.

Supporting Info

I confirmed the issue was resolved by swapping out the Let's Encrypt CA cert for Digicert in the test-values.yaml.

Big_Bang % kubectl get secret -n kiali tls-ca-sso -o jsonpath='{.data.ca\.pem}' | base64 -d | openssl x509 -noout -issuer

issuer=C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert Global Root G3

For Issue

Closes #2833 (closed)

Upgrade Notices

"N/A"