Legit-code: Add Linux support

[martin-lysk]

Feature Request: Linux Support

Summary

legit-code currently only supports macOS. This issue tracks adding support for Linux distributions.

Current Behavior

When running legit-code on Linux, users receive the error:

❌ Error: legit-code currently only supports macOS.

We detected you are running on Linux.

📋 We plan to support other operating systems!
   Please upvote or track our progress here:
   https://github.com/Legit-Control/monorepo/issues/61

Desired Behavior

legit-code should work seamlessly on popular Linux distributions (Ubuntu, Debian, Fedora, Arch, etc.)

Requirements

• Port NFS mounting logic to Linux
• Test on major Linux distributions
• Update documentation for Linux users
• Handle Linux-specific file system differences
• Add CI/CD for Linux testing

Technical Notes

The main differences to address:

• NFS mount commands differ from macOS (mount_nfs vs mount)
• File system case sensitivity
• Different package managers for dependencies
• Potential differences in shell behavior

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