fix regex to capture latest image to be used

This MR fixes the issue with deploying older images to our regex failing to capture the date format that changed to ISO8601 correctly.

Fixes #13 (closed)

.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