tests: don't test idempotence on in-place build (container case)

duck-rh · duck-rh · commit 35f7c5a4d95c · 2020-07-10T00:00:03.000+09:00
diff --git a/tasks/build.yml b/tasks/build.yml
@@ -9,4 +9,5 @@
       become_user: "{{ builder_username }}"
       become: True
       changed_when: True
+      tags: molecule-idempotence-notest
 
