Add gitiles project

Depends-On: https://gerrit-review.googlesource.com/c/zuul/jobs/+/328089
Change-Id: I9cbb5434d92e34f7f89a7ae65e41a74207a0dd94
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index c39539c..dc93321 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -296,9 +296,10 @@
 
 # Other projects
 
-# Attach the gitiles project to the check pipeline, but defer to
-# gitiles in-repo config for jobs.
 - project:
     name: gitiles
+    description: |
+      Build gitiles.
     check:
-      jobs: []
+      jobs:
+        - gitiles-build