refactor(main): change config to envs

[cuisongliu]

🤖 Generated by Copilot at 5a79e77

Summary

♻️✨🔥

Renamed the config package and command to env to better reflect its functionality of displaying and setting environment variables for sealos. Simplified the code and the output of the env command. Removed unused and redundant code related to configuration options.

Sing, O Muse, of the skillful sealos team, who changed their code with wisdom and care
They renamed the config package and command to env, to show the variables of their software's lair
They added a new cobra.Command for the env subcommand, with a long description clear and fair
They removed the redundant and unused code, and simplified the ConfigOption struct, like a sculptor of marble rare

Walkthrough

• Rename config package and command to env to display and set environment variables for sealos (link, link, link, link)
• Remove Set function and setValue method from env package as they are no longer needed (link, link)
• Simplify ConfigOption struct by removing AllowedValues and OSEnv fields and use constants for environment variable names (link, link, link)
• Delete pkg/system/config_cmd.go file as it is replaced by pkg/system/env_cmd.go (link)
• Update NewExampleConfig function in pkg/system/env_example.go to generate a simpler template string for the env command long description (link)
• Update tests in pkg/system/env_example_test.go to match the new template string (link)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2a83f67) 72.97% compared to head (51241ef) 72.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3121   +/-   ##
=======================================
  Coverage   72.97%   72.97%           
=======================================
  Files           8        8           
  Lines         618      618           
=======================================
  Hits          451      451           
  Misses        132      132           
  Partials       35       35           

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[fengxsong]

if option.OSEnv == "" {
        option.OSEnv = strings.ReplaceAll(strings.ToUpper(constants.AppName+"_"+option.Key), "-", "_")
}