Use 4c-8g node to build ngic-rtc docker images

Change-Id: Iaf4805552a3c7a6b2181b7f8b0b02937aca8e465
diff --git a/jjb/docker-publish-github.yaml b/jjb/docker-publish-github.yaml
index 148c228..6df76ec 100644
--- a/jjb/docker-publish-github.yaml
+++ b/jjb/docker-publish-github.yaml
@@ -27,7 +27,7 @@
     parameters:
       - string:
           name: buildNode
-          default: 'ubuntu16.04-basebuild-1c-2g'
+          default: '{build-node}'
           description: 'Name of the Jenkins node to run the job on'
 
       - string: