ignore namespace removal failure

.gitlab-ci.yml

@@ -24,7 +24,8 @@ include:
 .delete_helmrelease: &delete_helmrelease
   - cd ${CHART_DIR:-"."}
   - ./fully-delete-helmrelease.sh "nc$CI_MERGE_REQUEST_IID" "nc$CI_MERGE_REQUEST_IID"
-  - kubectl delete namespace "nc$CI_MERGE_REQUEST_IID"
+  # namespace removal fails if the namespace does not exist (yet), that's not a problem
+  - kubectl delete namespace "nc$CI_MERGE_REQUEST_IID" || true
 
 stages:
   - lint-helm-chart