Run exec as root

circle.yml

@@ -88,7 +88,7 @@ jobs:
             docker-compose exec web make -f Makefile-docker update_deps
             docker-compose exec web supervisorctl restart all
             # Start Test in Firefox docker container
-            docker-compose exec selenium-firefox tox -e ui-tests
+            docker-compose exec --user root selenium-firefox tox -e ui-tests
       - store_artifacts:
           path: ui-test.html
       - save_cache: