Fixed the backend test batch to actually show the coverage.

Changelog: Fixed

.gitlab-ci.yml

@@ -168,7 +168,17 @@ python tests:
     - curl http://elastic:9200/_cat/health
     - cd /app
   script:
-    - python -m pytest --cov=nomad -sv tests
+    - python -m pytest --cov=nomad --cov-report=xml -sv tests
+  after_script:
+    - cd /app
+    - cp coverage.xml $CI_PROJECT_DIR
+  coverage: /(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/
+  artifacts:
+    when: always
+    reports:
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage.xml
   rules:
     - if: $CI_COMMIT_TAG
       when: never