Test constraints with zuul-cloner in post queue

Add a simple job to openstack-manuals to test that zuul-cloner works
with constraints in the post queue. This will be removed again if
everything works as expected.

Related Change: Ib6d45031866790ee73000cf514e1263a7e8dff69
Change-Id: I7343d54185a896b847d6340532bdab22465e98f0

jenkins/jobs/manuals-jobs.yaml

@@ -131,3 +131,27 @@
     jobs:
       - gate-{name}-install-guide
       - '{name}-install-guide'
+
+# TODO(jaegerandi): Remove this again after testing. This is just for
+# testing that zuul-cloner works with constraints in the post queue.
+# It does not do anything usefull.
+- job:
+    name: zuul-cloner-test
+    node: ubuntu-trusty
+
+    builders:
+      - zuul-git-prep-upper-constraints
+      - install-distro-packages
+      - revoke-sudo
+      - shell: |
+          #!/bin/bash -xe
+          # Just output some information about git status and variables
+          echo $ZUUL_REFNAME
+          echo $ZUUL_BRANCH
+          git log -n2
+          git status
+      - tox:
+          envlist: zuul-cloner-test
+
+    publishers:
+      - console-log

zuul/layout.yaml

@@ -9477,6 +9477,7 @@ projects:
     post:
       - openstack-manuals-tox-doc-publishdocs
       - propose-openstack-manuals-updates
+      - zuul-cloner-test
 
   - name: openstack/openstack-planet
     template: