Add devstack base job for zuul v3
This should be managed in the devstack repo, since it's a base job to
run devstack.
Change-Id: Iffe54fbccbccd68db08f79a1b51dd7f76dbff408
Depends-On: Ie2119f24360d56690ffd772b95a9ea6b98dd4a39
diff --git a/roles/setup-devstack-cache/README.rst b/roles/setup-devstack-cache/README.rst
new file mode 100644
index 0000000..b8938c3
--- /dev/null
+++ b/roles/setup-devstack-cache/README.rst
@@ -0,0 +1,15 @@
+Set up the devstack cache directory
+
+If the node has a cache of devstack image files, copy it into place.
+
+**Role Variables**
+
+.. zuul:rolevar:: devstack_base_dir
+ :default: /opt/stack
+
+ The devstack base directory.
+
+.. zuul:rolevar:: devstack_cache_dir
+ :default: /opt/cache
+
+ The directory with the cached files.