add hello stage

vars/main.groovy

@@ -4,6 +4,9 @@ def call(String filepath) {
         //     $class: 'ExecuteDslScripts',
         //     targets: ['var/jobs.groovy'].join('\n'),
         // ])
+        stage('hello') {
+            sh 'echo helloworld'
+        }
         stage('build dsl jobs') {
             jobDsl targets: ['jobs.groovy'].join('\n')
         }