Added retry step to aptly publishing during pkg build

Change-Id: Ie9521f39aab5f43af9513944c420f303ca91825e
diff --git a/build-debian-packages-jmx-exporter.groovy b/build-debian-packages-jmx-exporter.groovy
index d6e7fbd..eaa9f05 100644
--- a/build-debian-packages-jmx-exporter.groovy
+++ b/build-debian-packages-jmx-exporter.groovy
@@ -58,7 +58,9 @@
 
                 stage("publish") {
                     aptly.snapshotRepo(APTLY_URL, APTLY_REPO, timestamp)
-                    aptly.publish(APTLY_URL)
+                    retry(2){
+                      aptly.publish(APTLY_URL)
+                    }
                 }
             }