GITLAB_CI: Add coverage highlighting

Signed-off-by: Taylor Smock <tsmock@fb.com>

.gitlab-ci.yml

@@ -134,6 +134,16 @@ test:
       junit: build/test-results/**/TEST-*.xml
   needs: ["assemble"]
 
+coverage:
+  stage: deploy
+  needs: ["test"]
+  image: haynes/jacoco2cobertura:1.0.3
+  script:
+    - 'python /opt/cover2cover.py build/reports/jacoco/test/jacocoTestReport.xml src/main/java > build/reports/jacoco/test/coverage.xml'
+  artifacts:
+    reports:
+      cobertura: "build/reports/jacoco/test/coverage.xml"
+
 compile against min JOSM:
   stage: test
   script: