docs: Automated CherryPick Update for release-v4.4

[sealos-ci-robot]

🤖 Generated by Copilot at e37aa85

Summary

🎨🐛🛠️

This pull request adds a new render subcommand to sealctl that can render template files with values and environment variables, using the helm library and the template package. It also simplifies and improves the code for the initsystem subcommand, and fixes some bugs and redundancies in the rootfs, file, and yaml packages.

sealctl render /
Templates with helm and data /
Autumn leaves change rootfs

Walkthrough

• Add a new render subcommand to sealctl that renders template files with values and environment variables (link)
• Refactor the initsystem subcommands to use a helper function that reduces code duplication and creates a consistent format (link, link)
• Replace the "path" package with the "path/filepath" package in the rootfs and template packages, which is more appropriate for manipulating file paths on the local system (link, link, link)
• Remove the redundant getClusterName method from the defaultRootfs struct and access the cluster name directly from the cluster object (link, link)
• Add a comment to the mountRootfs function, indicating that the rendering of the templates on the client side is not yet generally available, and that it will replace the current rendering on the server side in the future (link)
• Add the "strings" package to the cmd package, which is used to manipulate string values for the initsystem subcommands (link)
• Add two more packages to the rootfs package: "github.com/labring/sealos/pkg/utils/maps" and "github.com/labring/sealos/pkg/utils/strings", which provide some utility functions for working with maps and strings (link)
• Add the "k8s.io/apimachinery/pkg/util/sets" package to the file package, which is used to create a set of extensions for the FindFilesMatchExtension function (link)
• Add the FindFilesMatchExtension function to the file package, which takes a base path and one or more extensions, and returns a slice of file paths that match the extensions (link)
• Add the getRenderCommand function to the rootfs package, which takes the path to the sealctl binary and the target directory, and returns a shell command that invokes the sealctl render subcommand with the appropriate paths to the template directories (link)
• Modify the mountRootfs function to call the getRenderCommand function and execute the command on the remote server, before copying the files to the server, for both the rootfs and the application files (link, link)
• Fix a bug in the unmarshalStrict function in the yaml package, where the wrong error variable was returned (link)

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