Added DEBUG option to build salt-formula pipelines

Change-Id: I507bb28347484125dc6b9cb9952f6beeb4ca9042
diff --git a/jenkins/client/job/debian/packages/salt.yml b/jenkins/client/job/debian/packages/salt.yml
index a497c83..f792847 100644
--- a/jenkins/client/job/debian/packages/salt.yml
+++ b/jenkins/client/job/debian/packages/salt.yml
@@ -723,3 +723,6 @@
               UPLOAD_APTLY:
                 type: boolean
                 default: 'true'
+              DEBUG:
+                type: boolean
+                default: 'false'