Add error message to build description

Change-Id: Ifffce007fbe9d3bc47ea57c30ee652b5e0bdb680
diff --git a/docker-build-image-pipeline.groovy b/docker-build-image-pipeline.groovy
index a22439a..d91baac 100644
--- a/docker-build-image-pipeline.groovy
+++ b/docker-build-image-pipeline.groovy
@@ -48,6 +48,7 @@
   } catch (Throwable e) {
      // If there was an error or exception thrown, the build failed
      currentBuild.result = "FAILURE"
+     currentBuild.description = e.message
      throw e
   } finally {
      common.sendNotification(currentBuild.result,"",["slack"])