Merge branch 'container_scanning_duplicate_pipeline' into 'master'

Avoid duplicate pipeline due to container scanning job

See merge request gitlab-org/gitlab!62810

lib/gitlab/ci/templates/Security/Container-Scanning.gitlab-ci.yml

@@ -40,4 +40,5 @@ container_scanning:
   rules:
     - if: $CONTAINER_SCANNING_DISABLED
       when: never
-    - if: $GITLAB_FEATURES =~ /\bcontainer_scanning\b/
+    - if: $CI_COMMIT_BRANCH &&
+          $GITLAB_FEATURES =~ /\bcontainer_scanning\b/