Fix: Correct error handling pattern for Rust chmod command

[prjanitor]

Bug Description

The chmod command in the Rust case had incorrect error handling. The code called execCmd.Run() first, then attempted to call execCmd.CombinedOutput() to retrieve error output. However, CombinedOutput() also executes the command - it cannot be called after Run() has already executed.

Fix

Changed the error handling pattern from:

if err := execCmd.Run(); err != nil {
    cmdOutput, _ := execCmd.CombinedOutput()
    return string(cmdOutput), err
}

To:

cmdOutput, err := execCmd.CombinedOutput()
if err != nil {
    return string(cmdOutput), err
}

This correctly uses CombinedOutput() which both executes the command and captures its output in a single call.

Impact

This fix ensures that chmod errors are properly captured and reported when compiling Rust code.

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