simplify it a little

Jenkinsfile

@@ -55,16 +55,14 @@ pipeline {
             rm -rf /tmp/url-shortener/features /tmp/url-shortener/spec /tmp/url-shortener/coverage .git*
             cd /tmp
             tar -czvf url-shortener.tgz url-shortener/
-            mv url-shortener.tgz $CUR_DIR
             '''
         }
-        archiveArtifacts artifacts: 'url-shortener.tgz'
+        archiveArtifacts artifacts: '/tmp/url-shortener.tgz'
       }
     }
     stage('Clean up deliverable') {
       steps {
-        sh 'rm -rf /tmp/url-shortener'
-        sh 'rm -rf url-shortener.tgz'
+        sh 'rm -rf /tmp/url-shortener*'
       }
     }
   }