Add to jenkins gerrit credentials with password

Change-Id: I870ae13f346111e234859688efb66f671ebcd83c
Related-prod: PROD-31174
(cherry picked from commit ef9eabf915abeafee6c6dacee37ba5c86b3bd555)
diff --git a/jenkins/client/job/git-mirrors/downstream/init.yml b/jenkins/client/job/git-mirrors/downstream/init.yml
index fbfcd56..5a6257c 100644
--- a/jenkins/client/job/git-mirrors/downstream/init.yml
+++ b/jenkins/client/job/git-mirrors/downstream/init.yml
@@ -19,7 +19,7 @@
               type: git
               url: "${_param:jenkins_gerrit_url}/mk/mk-pipelines"
               branch: "${_param:jenkins_pipelines_branch}"
-              credentials: "gerrit"
+              credentials: ${_param:jenkins_gerrit_credentials}
               script: git-mirror-pipeline.groovy
             param:
               SOURCE_URL: