CI/CD: Add flawfinder

Signed-off-by: Vaibhav Gupta <vaibhav.gupta@cern.ch>

.gitlab-ci.yml

@@ -17,6 +17,13 @@ cppcheck:
   script:
     - make cppcheck
 
+flawfinder:
+  stage: analyse
+  image:
+    name: gitlab-registry.cern.ch/coht/common-containers/static-analysis:latest
+  script:
+    - make flawfinder
+
 documentation:
   stage: build
   image: