Render devstack ansible roles via zuul-sphinx

Change-Id: Ie0db5bcfdacc2543488704fe4428b68910bd6bf1
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 47087c5..9254c23 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -139,6 +139,8 @@
 Enable :doc:`devstack plugins <plugins>` to support additional
 services, features, and configuration not present in base devstack.
 
+Use devstack in your CI with :doc:`Ansible roles <roles>` for Zuul V3.
+
 Get :doc:`the big picture <overview>` of what we are trying to do
 with devstack, and help us by :doc:`contributing to the project
 <hacking>`.