Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -42,4 +42,6 @@ unit-test-job:   # This job runs in the test stage.
     - apt-get -y update
     - apt-get -y install python3
     - source ansible/bin/activate
-    - ansible-playbook site.yml -b -l localhost -e 'roles_path=../'
+    - ansible-playbook site.yml -b -l localhost
+  variables:
+    - ANSIBLE_ROLES_PATH: "../"