build-config.jpl: Print message when archiving all build files

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: If28d2fb119a2cc53fc3ba784807fa92fc444a0fb
diff --git a/jenkins/build-config.jpl b/jenkins/build-config.jpl
index 994e259..f95d8df 100644
--- a/jenkins/build-config.jpl
+++ b/jenkins/build-config.jpl
@@ -66,6 +66,7 @@
         }
       }
     } catch (Exception e) {
+      println("Archiving all build files due to build error (to allow investigate it)")
       archiveArtifacts artifacts: 'ci_build/**', allowEmptyArchive: true
       manager.buildFailure()
       verify = -1