feature: sealos create support for environment variable based template rendering

[LZiHaN]

🤖 Generated by Copilot at 4a8d504

Summary

📝🆕🎨

This pull request adds a new feature to the sealos create command that enables users to customize the cluster image with environment variables. It updates the pkg/buildah package to handle the rendering of template files with the given variables. It also updates the English and Chinese documentation of the command to explain and demonstrate the new option -e.

sealos create -e
Render cluster with env vars
Autumn leaves template

Walkthrough

• Add a new option -e, --env=[] to the sealos create command that allows users to specify environment variables for template rendering (link, link, link, link)
• Modify the example of the sealos create command in the documentation to include the -e option and explain its usage (link, link)
• Import the context, file, and errgroup packages in pkg/buildah/create.go to handle concurrent tasks and file operations (link, link)
• Add a conditional block to the create function in pkg/buildah/create.go that calls the runRender function if the env field is not empty (link)
• Add a new function runRender in pkg/buildah/create.go that uses the errgroup package to run multiple goroutines that render the template files in the cluster image with the template package (link)
• Add a new function RenderTemplatesWithEnv in pkg/buildah/util.go that renders the template files in the etc, scripts, and manifests subdirectories of a given file path with the template package and the environment variables (link)
• Add some new imports to the pkg/buildah/util.go file that are used by the RenderTemplatesWithEnv function (link)

refer to #3774

Supporting documentation:
https://sealos.io/docs/self-hosting/lifecycle-management/operations/build-image/build-image-go_template
https://sealos.io/docs/self-hosting/lifecycle-management/advanced-guide/template-function
https://sealos.io/docs/self-hosting/lifecycle-management/reference/sealos/app-cluster-image

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Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
pkg/env/env.go	64.40% <100.00%> (+11.59%)	⬆️

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/cherry-pick release-v4.4

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🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/labring/sealos/actions/runs/6734938619