ci: add coverage regex

.gitlab-ci.yml

@@ -58,6 +58,7 @@ test-all:
     - go test $(go list ./... | grep -v api/docs) -coverprofile=coverage.out -covermode count
     - go get github.com/boumenot/gocover-cobertura
     - go run github.com/boumenot/gocover-cobertura < coverage.out > coverage.xml
+  coverage: '/^coverage: (\d+.\d+)% of statements$/'
   artifacts:
     reports:
       coverage_report: