Pin test-image to 20.04

Pete Wall · petewall · commit 0245dd2d5cd0 · 2022-04-26T10:20:49.000-05:00
Signed-off-by: Pete Wall &lt;pwall@vmware.com&gt;
diff --git a/ci/Dockerfile b/ci/Dockerfile
@@ -1,6 +1,6 @@
 # Copyright 2021 VMware, Inc.
 # SPDX-License-Identifier: BSD-2-Clause
-FROM harbor-repo.vmware.com/dockerhub-proxy-cache/library/ubuntu
+FROM harbor-repo.vmware.com/dockerhub-proxy-cache/library/ubuntu:20.04
 
 WORKDIR /
 
