Filter image with PR number

.gitlab-ci.yml

@@ -413,7 +413,7 @@ cleanup_mr:
   script:
     - >
       IMAGE_TO_BE_DELETE=($(openstack image list --sort-column Name --sort-descending -f value -c Name -c ID
-      | awk -v REGEX='(ood|base|compute|gpu)-PR-' '{if ($0 ~ REGEX) print $1}'))
+      | awk -v REGEX="(ood|base|compute|gpu)-PR-$CI_MERGE_REQUEST_IID" '{if ($0 ~ REGEX) print $1}'))
     - |
       for img in ${IMAGE_TO_BE_DELETE[@]}; do
         openstack image delete ${img}