Specify SAST expectation from analyzer

See gitlab-org/gitlab#224541 (closed)

.gitlab-ci.yml

@@ -3,6 +3,7 @@ variables:
   DS_DISABLE_DIND: "true"
   SAST_DISABLE_DIND: "true"
   SAST_DEFAULT_ANALYZERS: "spotbugs"
+  SAST_REPORT_URL: "https://gitlab.com/gitlab-org/security-products/analyzers/$SAST_DEFAULT_ANALYZERS/-/raw/master/qa/expect/$CI_PROJECT_NAME/gl-sast-report.json"
 
 stages:
   - test