Support to `argocd-image-updater.argoproj.io/myimage.allow-tags` in digest Image Updater Strategy

[caormarc]

Is your feature request related to a problem? Please describe. As a common usage we tag our images using SemVer. Additionally we would like to use digest updater strategy in the same way it is defined, but instead of showing the some/image@sha256:<somelonghashstring> as image running, we would like to use the defined SemVer image tag.

Describe the solution you'd like The same way it is defined in Latest - Update Strategy using argocd-image-updater.argoproj.io/myimage.allow-tags: regexp: <semver-regexp>.

So the running image would be something like some/[email protected]. Assuming we setup it with a SemVer regexp.

Describe alternatives you've considered No alternatives come to my mind.

Additional context Latest - Update Strategy Digest - Update Strategy