Fix: Status 'unknown' for coverage badges

See merge request !334

Co-authored-by: Malte Bauch <malte.bauch@extern.h-da.de>

.gitlab/ci/.test.yml

@@ -6,6 +6,7 @@
     variables:
         GOSDN_LOG: "nolog"
         GOSDN_CHANGE_TIMEOUT: "5000ms"
+    coverage: '/total:\s+\(statements\)\s+(\d+.\d+\%)/'
     artifacts:
         when: always
         reports: