[gparted] Add CI job to test GParted on Ubuntu (!4)

[Curtis Gedak <gedakc src gnome org>]

commit 8cd2181b4933714f75cf9be1516cda03ce3c1ff4
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sun Jun 24 13:51:21 2018 +0100

    Add CI job to test GParted on Ubuntu (!4)
    
    Closes !4 - Add GitLab CI jobs to build and test GParted

 .gitlab-ci.yml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8116d4ce..7fb62ccd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -46,7 +46,11 @@ ubuntu_build:
   <<: *ubuntu_image_definition
   <<: *build_stage_definition
 
-# Check GParted unit tests and distcheck pass.
+# Check GParted unit tests and distcheck pass on CentOS and Ubuntu.
 centos_test:
   <<: *centos_image_definition
   <<: *test_stage_definition
+
+ubuntu_test:
+  <<: *ubuntu_image_definition
+  <<: *test_stage_definition