Cleanup GCP container registry and delete all tagged images but the latest one

list-gcp-container-reg-images.sh

#!/bin/bash

# this script lists all images and available tags and proposes commands to delete older images

# adapt the registry uri of the gcp container registry
registry=eu.gcr.io/YOUR_PROJECT_ID

NL=$'\n'
echo "fetching repos..."
repos=$(gcloud container images list --repository $registry | tail -n +2)

for repo in ${repos};
        do
                echo "fetching tags for ${repo}:"
                tags=$(gcloud container images list-tags "${repo}")
                echo "${tags}";
                echo "---"
                echo "to remove all images but the newest one:";
                for tag in $(echo "${tags}" | tail -n +3 | cut -f 1 -d ' ');
                        do
                                del="gcloud container images delete ${repo}@sha256:${tag} --force-delete-tags --quiet;"
                                echo "${del}"
                                alldel="${alldel}${NL}${del}"
                        done;
                echo "+++++++++++++++++++++++++++++"
                echo ""
        done;


echo "==== All delete commands ===="
echo "${alldel}"