give voltctl build more memory

Change-Id: Id88838ecb33b029c096f75625157e2167efd4160
diff --git a/jjb/verify/voltctl.yaml b/jjb/verify/voltctl.yaml
index e9ac060..08e9f52 100644
--- a/jjb/verify/voltctl.yaml
+++ b/jjb/verify/voltctl.yaml
@@ -28,6 +28,7 @@
     name: 'post-submit-voltctl-jobs'
     jobs:
       - 'github-release':
+          build-node: 'ubuntu16.04-basebuild-2c-4g'
           dependency-jobs: 'version-tag'
           github-organization: 'opencord'
           artifact-glob: 'release/*'