ensure-molecule: add test jobs.

Change-Id: Ie27f4743b0d61c43d92fbcbfdb5366156ca9e028

playbooks/ensure-molecule/run.yaml

@@ -0,0 +1,4 @@
+---
+- hosts: localhost
+  roles:
+    - ensure-molecule

zuul.d/jobs.yaml

@@ -1,4 +1,10 @@
 ---
+- job:
+    name: base-jobs-ensure-molecule
+    run: playbooks/ensure-molecule/run.yaml
+    nodeset:
+      nodes: []
+
 - job:
     name: vexxhost-tox-molecule
     parent: tox

zuul.d/project.yaml

@@ -2,7 +2,7 @@
 - project:
     check:
       jobs:
-        - noop
+        - base-jobs-ensure-molecule
     gate:
       jobs:
-        - noop
+        - base-jobs-ensure-molecule