Add canary nightly build job

Bug: twpowertools:20
Change-Id: I622c1d671ba8fc623a96ce5d92fd6edead6c90f1
diff --git a/playbooks/nightly-build/pre.yaml b/playbooks/nightly-build/pre.yaml
new file mode 100644
index 0000000..c4463a2
--- /dev/null
+++ b/playbooks/nightly-build/pre.yaml
@@ -0,0 +1,5 @@
+- hosts: all
+  roles:
+    - role: ensure-genmanifest
+    - role: ensure-cws-upload
+      version: "2.0.1"