Copy a settings bundle and set a useful version for testflight if its a Debug build. This happens post file copy and won't change your source files.

build_runscript.sh

#!/bin/bash

BUILD_VER=$(/usr/bin/defaults read ${CODESIGNING_FOLDER_PATH}/Info CFBundleVersion)
BUILD_APPNAME=$(/usr/bin/defaults read ${CODESIGNING_FOLDER_PATH}/Info CFBundleDisplayName)

if [ "$CONFIGURATION" == "Debug" ]; then
    echo leaving Settings.bundle in place.
    /usr/bin/defaults write ${CODESIGNING_FOLDER_PATH}/Info CFBundleDisplayName "WM ß - $BUILD_VER"
else
    rm -rf ${CODESIGNING_FOLDER_PATH}/Settings.bundle
fi

BUILD_DATE=$(date)

/usr/bin/defaults write ${CODESIGNING_FOLDER_PATH}/Info CFBuildDate "$BUILD_DATE"