Kustomize applies and notifies when no changes occur

[mbrancato]

In a multi-cluster setup (e.g. https://github.com/fluxcd/flux2-kustomize-helm-example), the kustomize controller will apply manifests and send notifications on any change to the git repo.

Looking at this example of a Kustomization resource:

https://github.com/fluxcd/flux2-kustomize-helm-example/blob/f0c2aaef48461d8099a8fff05893e9ebb96f1561/clusters/production/apps.yaml#L6-L13

The spec.path tells Flux where the config is for this cluster. If a change is made in a different path for a different cluster, it causes the kustomize controller to trigger. If would be great if the controller could detect if there are changes (git diff --name-only <currently applied commit> <new commit>) in the spec.path and only apply when there are changes.