fix(cf): add ci build info under build info (spinnaker#3655)

It can sit under here with the droplet build info. It isn’t ideal because it is not typed or shared more widely than CF. but it tags along for the ride everywhere that buildinfo goes.

clouddriver-cloudfoundry/src/main/java/com/netflix/spinnaker/clouddriver/cloudfoundry/model/CloudFoundryServerGroup.java

@@ -168,7 +168,8 @@ public Map getBuildInfo() {
       "metricsUri", metricsUri,
       "droplet", droplet,
       "id", id,
-      "serviceInstances", serviceInstances)
+      "serviceInstances", serviceInstances,
+      "ciBuild", ciBuild)
       .toJavaMap();
   }