Remove useless Jenkinsfile

Jenkinsfile

-pipeline {
-
-    agent any
-    tools {
-        maven 'mvn-default'
-        jdk   'openjdk-8'
-    }
-
-    options {
-        timeout(time: 60, unit: 'MINUTES')
-    }
-
-    stages {
-
-        stage('Cleaning') {
-            steps {
-                sh 'git clean -fdx'
-            }
-        }
-
-        stage('Build') {
-            steps {
-                script {
-                    if ( env.BRANCH_NAME ==~ /^release-[.0-9]+$/ ) {
-                        sh 'mvn verify assembly:single'
-                    }
-                    else {
-                        sh 'mvn verify site'
-                    }
-                }
-            }
-        }
-    }
-
-    post {
-        always {
-            archiveArtifacts artifacts: 'target/*.jar', fingerprint: true
-            script {
-                if ( env.BRANCH_NAME ==~ /^release-[.0-9]+$/ ) {
-                    archiveArtifacts artifacts: 'target/*.zip', fingerprint: true
-                }
-            }
-            junit testResults: '**/target/surefire-reports/*.xml'
-            jacoco execPattern:'target/**.exec', classPattern: '**/classes', sourcePattern: '**/src/main/java'
-            recordIssues enabledForFailure: true, tools: [mavenConsole(), java(), javaDoc()]
-            recordIssues enabledForFailure: true, tool:  checkStyle()
-            recordIssues enabledForFailure: true, tool:  spotBugs()
-        }
-    }
-}