Fix CI in mirrored repos

See merge request !641

.gitlab-ci.yml

@@ -7,7 +7,7 @@ variables:
     CLAB_VERSION: "0.48.6"
     GOLANG_VERSION: "1.21"
     GNMI_TARGET_IMAGE: registry.code.fbi.h-da.de/danet/gnmi-target/debian:master
-    GNMI_TARGET_INTEGRATION_IMAGE: "registry.code.fbi.h-da.de/danet/gosdn/gnmi-target-integration-test:${CI_COMMIT_SHA}"
+    GNMI_TARGET_INTEGRATION_IMAGE: "$CI_REGISTRY_IMAGE/gnmi-target-integration-test:${CI_COMMIT_SHA}"
 
 workflow:
   rules: