Add error message to build description

Change-Id: Ifffce007fbe9d3bc47ea57c30ee652b5e0bdb680
diff --git a/update-package.groovy b/update-package.groovy
index ea2259c..63e45ff 100644
--- a/update-package.groovy
+++ b/update-package.groovy
@@ -102,6 +102,7 @@
     } catch (Throwable e) {
         // If there was an error or exception thrown, the build failed
         currentBuild.result = "FAILURE"
+        currentBuild.description = e.message
         throw e
     }
 }