Enable staging website in .asf.yaml
diff --git a/.asf.yaml b/.asf.yaml
index 3486904..c5ab4dc 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -1,2 +1,6 @@
 publish:
   whoami: master
+
+staging:
+  profile: ~
+  whoami:  stage