Clear specify host execution path with shell cmd

[feiyu11859661]

Merge Checklist

All boxes should be checked before merging the PR

• The changes in the PR have been built and tested
• Ready to merge

Description

Any Newly Introduced Dependencies

How Has This Been Tested?

[Copilot]

Pull Request Overview

This PR standardizes the execution path parameter across shell command invocations by replacing empty strings ("") with the explicit shell.HostPath constant. The constant itself is updated from an empty string to "/", clearly indicating host system execution context.

Key Changes:

• Updated shell.HostPath constant from "" to "/"
• Replaced all empty string parameters in shell.ExecCmd* and shell.IsCommandExist calls with shell.HostPath constant
• Ensures consistent and explicit specification of host execution context throughout the codebase

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/utils/shell/shell.go	Changed HostPath constant from empty string to "/"
internal/utils/system/system.go	Updated ExecCmd calls to use shell.HostPath for host OS detection commands
internal/utils/mount/mount.go	Standardized mount operations to explicitly use shell.HostPath
internal/utils/file/file.go	Updated file operations to use shell.HostPath constant
internal/utils/compression/compression.go	Applied shell.HostPath to compression/decompression commands
internal/provider/emt/emt.go	Updated dependency installation to use shell.HostPath
internal/provider/elxr/elxr.go	Updated dependency installation to use shell.HostPath
internal/provider/azl/azl.go	Updated dependency installation to use shell.HostPath
internal/image/*	Applied shell.HostPath across all image building modules
internal/chroot/*	Standardized chroot-related operations to use shell.HostPath

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.