shell script to clean all but last N images in gcr

clean-gcr-images.sh

#!/bin/bash
repoAddress="xx.gcr.io/xXx"
repos=$(gcloud container images list --format='table[no-heading](name:sort=1)' --repository=repoAddress)
while read -r repo; do
  images=$(gcloud container images list-tags --limit=99999 --sort-by=~timestamp --format='get(digest)' $repo)
  n=10
  while read -r image; do
    if (( n < 1 )); then
      gcloud container images delete --quiet "$repo@$image"
    fi;
    n=$((n-1))
  done <<< "$images"
done <<< "$repos"