the block confidential script is not blocking the kubeconfig file

Hello experts,

We are using the platform samples the block confidential pre-receive script in our environment. It was working as expected.
but when we scanned the GitHub data , we could identify that the kubeconfig files are not getting blocked.

Could you please suggest us to add the best regex to find the kubeconfig file and block it through pre-receive script..

首先定位平台示例中用于阻止机密内容的 pre-receive 脚本，并阅读其中现有 secret 模式的匹配方式。使用 kubeconfig 文件重现扫描，然后为该输入添加覆盖测试，并确认 hook 会拒绝它，同时不会破坏现有的机密文件检查。

由索引模型根据 Issue 内容生成。