be able to set custom env vars on server pod

[jmazzitelli]

fixes: kiali/kiali#7569

[jmazzitelli]

To test, build and push the images and run the molecule test config-values-test:

hack/k8s-minikube.sh start && \
hack/k8s-minikube.sh istio && \
make -e CLUSTER_TYPE=minikube cluster-push && \
hack/run-molecule-tests.sh --client-exe "$(which kubectl)"  --minikube-exe $(which minikube) --cluster-type minikube -udi true -at config-values-test

If you would like to do manual testing, create/deploy the operator and Kiali CR (e.g. make -e CLUSTER_TYPE=minikube cluster-push operator-create kiali-create) and then edit the Kiali CR, adding your own spec.deployment.custom_envs to it. Then see that the operator creates the Kiali server pod with those env vars. This is what the molecule test does.

[jshaughn]

I tested this the manual way and it worked.