change SECURE_LOG_LEVEL to be fatal so it doesn't print too many information

.gitlab-ci.yml

@@ -5,7 +5,7 @@ include:
 container_scanning:
   variables:
     CS_IMAGE: prod-repo.cecs.anu.edu.au:443/jekyll-anu/docker/anu-jekyll-build:$CI_COMMIT_TAG
-    SECURE_LOG_LEVEL: debug
+    SECURE_LOG_LEVEL: fatal
   tags:
     - Pages
   rules: