Remove the allow_failure for lizard.

.gitlab-ci.yml

@@ -250,12 +250,12 @@ cppcheck:
 
 ###############################################################################
 # lizard - Cyclomatic Complexity Analyzer
-# Allow failure for this job, as lizard is failing when warnings are found.
+# Ignore warnings is manually set to 400, as we do not want this job to fail.
 lizard:
   stage: analyze
 
- # only:
- #   - open_source@irmb/VirtualFluids_dev
+  only:
+    - open_source@irmb/VirtualFluids_dev
 
   image: irmb/virtualfluids-python-deps-ubuntu20.04
 
@@ -270,14 +270,12 @@ lizard:
 
   script:
     - cd $CI_PROJECT_DIR
-    - lizard -l cpp src/ > lizard.txt --warnings_only
+    - lizard -l cpp src/ > lizard.txt --warnings_only --ignore_warnings 400
 
   artifacts:
     paths:
       - lizard.txt
 
-  allow_failure: true
-
 ###############################################################################
 # code coverage
 gcov_gcc_9: