Check SAST_DISABLE when SAST_DISABLE_DIND is set

changelogs/unreleased/22166-fix-sast-template.yml

+---
+title: Check both SAST_DISABLE and SAST_DISABLE_DIND when executing SAST job template
+merge_request: 22166
+author:
+type: fixed

lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml

@@ -55,6 +55,7 @@ sast:
   services: []
   except:
     variables:
+      - $SAST_DISABLED
       - $SAST_DISABLE_DIND == 'false'
   script:
     - /analyzer run