Enable proxy authentication to the apiserver

Proxy authentication is required for the apiserver to properly authenticate against aggregated services, like some webhooks.

This was discovered as an issue after CertManager failed to call into webhooks for DNS-based certificates to be generated.

assigned to @kaiyou

This was tested on an actual deployment, however the CA is not properly published.

added 1 commit

• 19fba917 - Properly publish the requestheader CA and authentication info

Compare with previous version

added 1 commit

• e20028bf - Finish supporting requestheader authentication on par with vanilla

Compare with previous version

This has been running with success on test cluster since yesterday, let's merge

mentioned in commit d4e16258

merged