Update jenkins file to generate tar

Jenkinsfile.gradle

@@ -13,8 +13,6 @@ node {
     checkout scm
   }
 
-  parallel(
-    frontend: {
   stage('Build Frontend Assets') {
     docker.image('aoepeople/fe-build-env:1.2.0').inside() {
       ansiColor('xterm') {
@@ -23,6 +21,9 @@ node {
       }
     }
   }
-    },
-  )
+
+  stage('Archive Artifacts') {
+    sh "tar -czvf techradar.tar.gz -C dist/ ."
+    archiveArtifacts artifacts: 'techradar.tar.gz', onlyIfSuccessful: true
+  }
 }