Update CNB tools

Author: cf-buildpacks-eng

scripts/package.sh

@@ -9,12 +9,12 @@ PACKAGE_DIR=${PACKAGE_DIR:-"${PWD##*/}_$(openssl rand -hex 4)"}
 full_path=$(realpath "$PACKAGE_DIR")
 args=".bin/packager -uncached"
 
-if [ $1 == "-c" ] || [ $2 == "-c" ]; then #package as cached
+if [[ $1 == "-c" ]] || [[ $2 == "-c" ]]; then #package as cached
     full_path="$full_path-cached"
     args=".bin/packager"
 fi
 
-if [ $1 == "-a" ] || [ $2 == "-a" ]; then #package as archive
+if [[ $1 == "-a" ]] || [[ $2 == "-a" ]]; then #package as archive
     args="${args} -archive"
 fi
 eval "$args $full_path"