clean containerd cri images

clean-images.py

#!/usr/bin/python3
import json
import itertools
import subprocess


out = subprocess.check_output(["crictl", "images", "-o", "json"])
images = json.loads(out.decode("utf-8"))
tags = itertools.chain.from_iterable([i["repoTags"] for i in images["images"]])
for repo, repo_tags in itertools.groupby(tags, lambda x: "".join(x.split(":")[:-1])):
    old_tags = sorted(repo_tags, key=lambda x: x.split(":")[-1])[:-1]
    for tag in old_tags:
        subprocess.run(["crictl", "rmi", tag])