fix regex to capture image to be deleted

.gitlab-ci.yml

@@ -81,7 +81,7 @@ tf-apply:
     - |
       if [ -z $TF_VAR_image_ohpc ];
       then
-      XDMOD_IMAGES=($(openstack image list --sort-column Name --sort-descending -f value -c Name -c ID | grep -P " xdmod-${TARGET_ENV}-\d{14}$" | awk '{print $2}'))
+      XDMOD_IMAGES=($(openstack image list --sort-column Name --sort-descending -f value -c Name -c ID | grep -P " xdmod-$TARGET_ENV-\d{4}-\d{2}-\d{2}T\d{6}$" | awk '{print $2}'))
       export TF_VAR_image_ohpc="${XDMOD_IMAGES[0]}"
       echo $TF_VAR_image_ohpc
       else