chmod +x bootstrap files before execution

[Copilot]

Bootstrap scripts may lack execute permissions when checked out from git (especially on Windows) or created without proper permissions. This causes execution to fail.

Changes

• main.go: Added os.Chmod(bootstrapFilePath, 0755) before executing bootstrap scripts
• integration_test.go: Added test verifying bootstrap files without execute permissions are handled correctly

The fix ensures bootstrap scripts work regardless of their initial permissions:

if _, err := os.Stat(bootstrapFilePath); err == nil {
    // Make bootstrap file executable before running
    if err := os.Chmod(bootstrapFilePath, 0755); err != nil {
        return fmt.Errorf("failed to chmod bootstrap file %s: %w", bootstrapFilePath, err)
    }
    
    cmd := exec.CommandContext(ctx, bootstrapFilePath)
    // ...
}

Original prompt

chmod +x the bootstrap files before running them

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