[CORD-2188] Multi-stage build for UI containers

Change-Id: Ib4323e68821036945a271a381c2afb427b71594b
(cherry picked from commit 9acc16bbbf7c615d36394e64ed6efbd03aa9c880)
diff --git a/docker_images.yml b/docker_images.yml
index 227a804..a603782 100644
--- a/docker_images.yml
+++ b/docker_images.yml
@@ -110,13 +110,13 @@
   - name: xosproject/xos-ws
     repo: xos-rest-gw
 
+  - name: xosproject/xos-gui-builder
+    repo: xos-gui
+    dockerfile: "Dockerfile.xos-gui-builder"
+
   - name: xosproject/xos-gui
     repo: xos-gui
 
-  - name: xosproject/xos-gui-extension-builder
-    repo: xos-gui
-    dockerfile: "Dockerfile.xos-gui-extension-builder"
-
   - name: xosproject/gui-extension-rcord
     repo: rcord
     path: "xos/gui"