Add job builds discarder

Change-Id: I7a4a46826b547731b91f2ed1f58927ba4ddd4455
diff --git a/jenkins/client/job/deploy/update/saltenv.yml b/jenkins/client/job/deploy/update/saltenv.yml
index 1ce1494..734a4e5 100644
--- a/jenkins/client/job/deploy/update/saltenv.yml
+++ b/jenkins/client/job/deploy/update/saltenv.yml
@@ -19,6 +19,11 @@
             display_name: "Deploy - update {{name}} environment"
             type: workflow-scm
             concurrent: false
+            discard:
+              build:
+                keep_num: 10
+              artifact:
+                keep_num: 10
             scm:
               type: git
               url: "${_param:jenkins_gerrit_url}/salt-models/{{name}}"