Add a C++ linting job via git-clang-format

Change-Id: Ia21fdbb236b6e8541ba58c5710cc5cfec62568ee
diff --git a/zuul.yaml b/zuul.yaml
index 4a94f15..6aee5c9 100644
--- a/zuul.yaml
+++ b/zuul.yaml
@@ -63,3 +63,15 @@
     description: |
       Build on Fedora 29 with clang and ASAN+UBSAN sanitizers.
     parent: run-ci-build-sh
+
+- job:
+    name: clang-format
+    description: |
+      Lint the current change via git-clang-format
+    run: playbooks/clang-format/run.yaml
+    failure-url: git-clang-format.patch
+    nodeset:
+      nodes:
+        - name: w
+          label: f29
+    timeout: 120