Build Config: Archive build dir when build failed

Archive build dir when build failed. Artifacts can help to investigate
the error cause.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: If0117b16eb82c8ec5dea205727d6fa616a168fe8
diff --git a/jenkins/build-config.jpl b/jenkins/build-config.jpl
index d09a43c..8af6227 100644
--- a/jenkins/build-config.jpl
+++ b/jenkins/build-config.jpl
@@ -55,6 +55,7 @@
         }
       }
     } catch (Exception e) {
+      archiveArtifacts artifacts: 'trusted-firmware-m/build/**', allowEmptyArchive: true
       manager.buildFailure()
       verify = -1
     } finally {