add missing 3a-jenkins-Jenkinsfile.groovy good-3a-jenkins.json

good-1-sealed-secrets.json     good-3b-tekton.json
good-1-the-basics.json	       good-3-ubiquitous-journey.json
good-2-app-of-apps.json        good-4-extend-uj.json
good-2-argocd.json	       good-5-this-is-gitops.json directive

Author: jfilipcz

tests/doc-regression-test-files/3a-jenkins-Jenkinsfile.groovy

@@ -97,6 +97,7 @@ pipeline {
 			    git clone ${GIT_URL} pet-battle && cd pet-battle
 			    git checkout ${BRANCH_NAME}
 			    '''
+					dir('pet-battle'){
                 script {
                     env.VERSION = sh(returnStdout: true, script: "npm run version --silent").trim()
                     env.PACKAGE = "${APP_NAME}-${VERSION}.tar.gz"