ci: fix and enhance coverage report

.gitlab-ci.yml

@@ -60,9 +60,14 @@ unit:
   script:
     - npm run check-icons
     - npm run test -- --watch=false --no-progress --code-coverage
+  coverage: '/Statements[^:]*\:[^:]*\s+([\d\.]+)%/'
   artifacts:
     paths:
-    - coverage
+      - coverage
+    reports:
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage/cobertura-coverage.xml
 
 # Disabled until redesign is settled
 #