try to fix script to clean given docker images

cleanImages.sh

@@ -1,11 +1,12 @@
 #!/bin/bash
 set -x
 
-echo $IMAGES_TO_BE_DELETED
+imagesToBeDeleted=$1
+echo $imagesToBeDeleted
 echo "List all images:"
 docker images -a
 
-docker_images_list=$(docker images | grep '$IMAGES_TO_BE_DELETED' | awk '{print $3}' | uniq)
+docker_images_list=$(docker images | grep '$imagesToBeDeleted' | awk '{print $3}' | uniq)
 if [ "$docker_images_list" == "" ]; then
     echo "No docker images on the agent"
 else