gitlab/azure: Enable LLVM tests

Now that we have again fixed the problems that building with clang
exposes, enable these tests on Azure and GitLab-CI as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9b295ac..0f5271d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -178,6 +178,14 @@
     BUILDMAN: "^sandbox$"
   <<: *buildman_and_testpy_dfn
 
+sandbox with clang test.py:
+  tags: [ 'all' ]
+  variables:
+    TEST_PY_BD: "sandbox"
+    BUILDMAN: "^sandbox$"
+    OVERRIDE: "-O clang-7"
+  <<: *buildman_and_testpy_dfn
+
 sandbox_spl test.py:
   tags: [ 'all' ]
   variables: