istio-operator ARM support

[tiswanso]

Is your feature request related to a problem? Please describe.
arm64 will be supported in Istio 1.15: istio/istio#26652 (comment)

This is an enhancment request for istio-operator to be built for ARM and support deploying Istio to ARM target architectures

Describe the solution you'd like to see
istio-operator release artifacts built and available for ARM architectures. Also, target arch detection or configuration for istio-operator to manage deployment of Istio arm artifacts.

Describe alternatives you've considered

Additional context
With the solution of #857 it could be possible for Istio admins to add sidecar injection templates for ARM arch sidecar/gateway images. That would support scenarios like:

1. Kubernetes Nodes with different architectures
2. multicluster/mesh expansion scenarios with single Istio control-plane and different clusters with different node architectures