image updater post-sync hook

[lhenry7]

Is your feature request related to a problem? Please describe.
I need to run an ArgoCD post-sync hook, but only when the sync is the result of image updater "deploying" a new image:tag and not when ArgoCD is just syncing to bring the App back into compliance with values.yaml file. This would effectively make it a post-deploy hook similar to the Helm post-install hook

Describe the solution you'd like
A way to trigger a post-sync hook from image updater that would match a Helm post-install hook semantic.

Describe alternatives you've considered
Couldn't think of any

Additional context
None