Update Jenkinsfile

Jenkinsfile

 pipeline {
     agent {label 'jenkins-jnlp'}
+    triggers {
+    GenericTrigger(
+     genericVariables: [
+      [key: 'ref', value: '$.ref']
+     ],
+     causeString: 'Triggered on $ref',
+     token: 'searchhotcrawler123',
+     printContributedVariables: true,
+     printPostContent: true,
+     silentResponse: false,
+     regexpFilterText: '$ref',
+     regexpFilterExpression: 'refs/heads/' + BRANCH_NAME
+    )
+  }
     stages {
         stage('build') {
             when { branch 'master' }