add zuul noop jobs

add safe jobs we know can't fail so that we can use
zuuls speculitve merge feature to add complex ones
later.

Author: SeanMooney

.zuul.yaml

@@ -0,0 +1,9 @@
+---
+
+- project:
+    name: openstack-k8s-operators/placement-operator
+    default-branch: main
+    merge-mode: rebase
+    github-check:
+      jobs:
+        - noop