Add checking docker images with DNS sni proxies

この issue には説明がありません。

The issue title suggests adding DNS SNI proxy checking for Docker images, but the body is empty. Look at the existing CLI tools in the repository, especially those related to Docker and DNS. Determine how Docker images are currently checked and what a DNS SNI proxy integration would entail. Start by examining the codebase structure and any existing Docker or network-related modules.

索引モデルが issue の本文から書いたものです。