cleanup docker registry. delete all the tags from the list of the repositories

cleanup docker registry

# inspired by the https://gist.github.com/jaytaylor/86d5efaddda926a25fa68c263830dac1
registry="http://${registry_user}:${registry_passwd}@${registry_url}/v2"
for repo in `cat repos-todel`; do
    for tag in $(curl -sSL "${registry}/${repo}/tags/list" | jq -r '.tags[]?'); do    
        tagURL="${registry}/${repo}/manifests/${tag}"
        sha256=$(curl -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -sSL -I ${tagURL} | awk '$1 == "Docker-Content-Digest:" { print $2 }' | tr -d $'\r')
        deleteURL="${registry}/${repo}/manifests/${sha256}"
        echo $deleteURL
        # curl -v -sSL -X DELETE $deleteUR
    done
done