CORD-1000 Build and publish XOS images on corddev

Change-Id: I9cb44aacba4467111ee597ecefb8547024a0704a
diff --git a/Dockerfile b/Dockerfile
index b8a636c..911bd15 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM xosproject/xos-gui-extension-builder
+FROM xosproject/xos-gui-extension-builder:candidate
 
 # Set environment vars
 ENV CODE_SOURCE .