proposed feature: more flexibility in "kustomize edit set image"

[krancour]

From #1981:

@Brightside56 Kargo Render passes images to the Argo CD Repo Server (which it uses as a library) i the form url=tag. Somewhere under the covers, the Argo CD Repo Server executes a kustomize edit set image url=tag. For Kargo's built-in Kustomize support, Kargo executes kustomize edit set image url=tag more directly...

I see your issue is that the image URL varies from Stage to Stage.

I believe your case can be addressed by adding more options to both Kargo Render and to Kargo's built-in Kustomize support such that the resulting command resembles this: kustomize edit set image placeholder-url=stage-specific-url:tag where placeholder-url and stage-specific-url are both things you specific in your promotion mechanisms on a Stage-by-Stage basis, which will leave the tag as the only part of the Freight that is applied from one Stage to the next.