Add checksum to install script

If the download is corrupted, for example, the install will never work because that corrupted file is cached.

Maybe could also detect a failure to install and clear the cache. Or add a command to clear the cache and offer that as a potential solution in the output.

See https://github.com/coder/code-server/issues/6767

首先找到安装脚本，并查看关于下载损坏场景的 issue #6767。跟踪下载的缓存方式以及安装失败的报告方式；当损坏的下载在重新使用前被检测到，并且输出提供适当的缓存恢复路径时，即视为完成。

由索引模型根据 Issue 内容生成。