在HarborUI界面删除镜像，但磁盘空间并未释放，只是镜像文件的映射关系，还需要通过GC来删除。
- Stop harbor:
docker-compose stop
with -dry-run option, the image file is about to be printed in addition to, but not deleted
docker run -it --name gc --rm --volumes-from registry vmware/registry:2.6.2-photon garbage-collect --dry-run /etc/registry/config.yml
不带–dry-run选项，直接执行删除：
docker run -it --name gc --rm --volumes-from registry vmware/registry:2.6.2-photon garbage-collect /etc/registry/config.yml
Start Harbor:
docker-compose start
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