Xcode run script build phase to deal with Mapbox access tokens

Mapbox Private Access Tokens.sh

token_file=~/.mapbox
token=`cat $token_file`
info_plist=$TARGET_BUILD_DIR/$INFOPLIST_PATH
current_token=`/usr/libexec/PlistBuddy -c "Print :MGLMapboxAccessToken" $info_plist`

if [ "$current_token" ]; then
  exit 0
elif [ "$token" ]; then
  plutil -replace MGLMapboxAccessToken -string $token $info_plist
else
  echo 'error: Missing Mapbox access token'
  open 'https://www.mapbox.com/studio/account/tokens/'
  echo "error: Get an access token from <https://www.mapbox.com/studio/account/tokens/>, then create a new file at $token_file that contains the access token."
exit 1
fi