Add canary nightly build job

Bug: twpowertools:20
Change-Id: I622c1d671ba8fc623a96ce5d92fd6edead6c90f1
diff --git a/roles/cws-publish/defaults/main.yaml b/roles/cws-publish/defaults/main.yaml
new file mode 100644
index 0000000..4055a80
--- /dev/null
+++ b/roles/cws-publish/defaults/main.yaml
@@ -0,0 +1 @@
+dryrun: false