Adding HippieOSS image

Change-Id: I813cc031bd4e54253cf8e811bd4552252d66e307
diff --git a/developer/docker_images.yml b/developer/docker_images.yml
index dffdfc3..ba2e913 100644
--- a/developer/docker_images.yml
+++ b/developer/docker_images.yml
@@ -248,6 +248,10 @@
     repo: progran
     dockerfile: "Dockerfile.synchronizer"
 
+  - name: xosproject/hippie-oss-synchronizer
+    repo: hippie-oss
+    dockerfile: "Dockerfile.synchronizer"
+
   - name: xosproject/xos-api-tester
     repo: cord-tester
     path: "src/test/cord-api"