use multi branch example to first show single container pipeline

Author: g0t4

Jenkinsfile

@@ -1,43 +1,12 @@
 pipeline {
-  agent none
+  agent { docker "maven" }
 
   stages {
-
     stage('maven') {
-      agent { docker "maven" }
       steps {
         sh "mvn -version"
         sh "java -version"
       }
     }
-
-    stage('node') {
-      agent { docker "node" }
-      steps {
-        sh "node --version"
-      }
-    }
-
-    stage('python') {
-      agent { docker "python" }
-      steps {
-        sh "python3 --version"
-      }
-    }
-
-    stage('golang') {
-      agent { docker "golang" }
-      steps {
-        sh "go version"
-      }
-    }
-
-    stage('gradle') {
-      agent { docker "gradle" }
-      steps {
-        sh "gradle --version"
-      }
-    }
-
   }
 }