Add flag to override GRPC Authority Header

[aliaqel-stripe]

Proposal

We would like to be able to pass a command-line flag to the KEDA Adapter to override the GRPC Authority Header in the requests it makes to the KEDA Operator.

Use-Case

The address we use for our envoy proxy is not in the SAN provided by TLS Certificate of the pod that comes from our CA. If we can override the Authority Header with host name we know will be in the SAN of the certificate returned from the Envoy Proxy, we won't need to disable TLS.

Is this a feature you are interested in implementing yourself?

Yes

Anything else?

No response