Add new Jenkins Airship job update_nordix_artifacts

Add a scheduled job for keeping artifacts used by the Metal3 project and
development environment up to date from upstream.

Change-Id: I2446df76e868229641d29b53cbf63b95e106bd43
diff --git a/jjb/airship/projects.yml b/jjb/airship/projects.yml
index f66e8bf..bcc5e0e 100644
--- a/jjb/airship/projects.yml
+++ b/jjb/airship/projects.yml
@@ -35,6 +35,7 @@
     - linter_tests
     - openstack_image_building
     - docker_image_building
+    - update_nordix_artifacts
     - update_nordix_repos
     - openstack_node_image_building
     repo: