Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -19,6 +19,7 @@ test:
     - docker build --pull -t rights-engine-test ./src
     - mkdir coverage_report
     - ls -la
+    - docker volume create coverage_report
     - docker run -v coverage_report:/coverage_report rights-engine-test sh -c "coverage run --source='.' manage.py test && coverage report -m && coverage xml -i && mv coverage.xml /coverage_report && ls -la && ls -la /coverage_report"
     - ls -la
     - ls -la coverage_report