[istio.io testing] Need test for Plugging in External CA Key and Certificate

[brian-avery]

Describe the feature request
We need to develop a test for the Plugging in External CA Key and Certificate task in order to provide automated testing of the Istio.io website for future releases.

Example tests and the documentation for the framework can be found here: https://github.com/istio/istio/tree/master/tests/integration/istioio

A YouTube video describing the usage of the framework can be found here: https://www.youtube.com/watch?v=3y-z8NaVwr0

Please reach out to the Test and Release channel on the Istio Slack or Test and Release Discuss with any questions.

[checkaayush]

I'd like to pick this up.

[howardjohn]

this is tested now https://preliminary.istio.io/latest/docs/tasks/security/cert-management/plugin-ca-cert/