增加指定maven

Jenkinsfile

@@ -1,6 +1,15 @@
 pipeline {
     agent any
-
+    tools {
+            maven 'M3'  // 这个名称要和 Global Tool Configuration 中一致
+    }
+    stages {
+        stage('Build with Maven') {
+            steps {
+                sh 'mvn clean package'
+            }
+        }
+    }
     environment {
         APP_NAME = "sczx-app"
         DOCKER_IMAGE = "${APP_NAME}:latest"