Dynamic container-image tag

Hi
We’re using shinyproxy with k8s. Is it possible to change the container image tag without restarting shiny proxy? We can of course re-tag a prod image in harbor; but would like to know if we can implement some kind of gitops model to somehow inject a tag when it’s ready for release.
I do read that container-image support spEL; but unsure how we can implement this.