Customizing the Istio installation configuration
Created by: RolandMa1986
Signed-off-by: Roland.Ma rolandma@kubesphere.io Allow users to customize the Istio installation configuration. To merge the YAML file added yq to the base docker image.
fix: https://github.com/kubesphere/kubesphere/issues/4577 https://github.com/kubesphere/kubesphere/issues/4465