package path incorrect in cp command of postinstall script.

Hi, 

cp command in the postinstall created by app does not have the full path. it shows `cp "MicrosoftTeams.pkg" "$tempDir/"` instead of `cp "/private/tmp/MicrosoftTeams.pkg" "$tempDir/"`

<img width="810" height="194" alt="Image" src="https://github.com/user-attachments/assets/ec9390ca-30ac-4c29-bfee-63911a54b55b" />

Thanks.