use tmp as a staging place for building the tgz file

Jenkinsfile

@@ -49,11 +49,13 @@ pipeline {
       steps {
         catchError(buildResult: 'FAILURE', stageResult: 'FAILURE') {
           sh ''' #!/usr/local/bin/bash
-            mkdir -p url-shortener
-            shopt -s extglob
-            cp -R !(url-shortener) url-shortener/
-            rm -rf url-shortener/features url-shortener/spec url-shortener/coverage
+            CUR_DIR=$(pwd)
+            mkdir -p /tmp/url-shortener
+            cp -R * /tmp/url-shortener
+            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'
@@ -61,7 +63,7 @@ pipeline {
     }
     stage('Clean up deliverable') {
       steps {
-        sh 'rm -rf url-shortener'
+        sh 'rm -rf /tmp/url-shortener'
         sh 'rm -rf url-shortener.tgz'
       }
     }