refactor(main): enable build flags isolation

[cuisongliu]

🤖 Generated by Copilot at dcb3296

Summary

🚫🛠️🐳

Removed isolation flag from build command in pkg/buildah/common.go. This flag is not needed for sealos, which uses Kubernetes for container management.

isolation flag
gone from build command list
sealos uses k8s

Walkthrough

• Remove isolation flag from hidden flags in build command (link) to avoid confusion and unnecessary complexity for sealos users

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c9f4f58) 72.30% compared to head (dcb3296) 72.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3086   +/-   ##
=======================================
  Coverage   72.30%   72.30%           
=======================================
  Files           8        8           
  Lines         603      603           
=======================================
  Hits          436      436           
  Misses        132      132           
  Partials       35       35           

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