I am building some custom packages that contain some bash scripts in them that need to be executable after the package is installed.  On my build box, I set the permissions to chmod 755 *.sh and all of the .sh scripts are showing as executable.  However, after I build the firmware and flash it to the router, all of the packages are

-rw-r--r--

How do I retain the permissions that the scripts originally had, or else have the installer set the scripts to executable after they get installed as part of the firmware? 

Thanks!