Add noop job to the check pipeline

Otherwise changes in this repo can't get merged without manually voting
Verified+1.

Change-Id: I42165ee23ae9156c1b1e5ee6ff5e35b6890000b7
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
new file mode 100644
index 0000000..4360557
--- /dev/null
+++ b/zuul.d/projects.yaml
@@ -0,0 +1,5 @@
+- project:
+    name: zuul/jobs
+    check:
+      jobs:
+        - noop