Add run-docs role and tox-docs job

Change-Id: I0bdb5b461950533880157c09463a3256967c81c7
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/playbooks/roles/run-docs/defaults/main.yaml b/playbooks/roles/run-docs/defaults/main.yaml
new file mode 100644
index 0000000..5855a3d
--- /dev/null
+++ b/playbooks/roles/run-docs/defaults/main.yaml
@@ -0,0 +1,2 @@
+---
+run_docs_envlist: venv