Add high-availability plugin to the check pipeline

Change-Id: Ib4de5ddaf2d31d71cd46437db366062d73207585

zuul.d/projects.yaml

diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index c6beb26..b151637 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -129,6 +129,12 @@
         - gerrit-plugin-build
 
 - project:
+    name: plugins/high-availability
+    check:
+      jobs:
+        - gerrit-plugin-build
+
+- project:
     name: plugins/lfs
     check:
       jobs: