Remove pipeline.

Jenkinsfile

-pipeline {
+node {
+    label 'docker'
     def customImage
-    agent {
-        node {
-            label 'docker'
-        }
-    }
-    options {
-        timeout(time: 1, unit: 'HOURS')
-        buildDiscarder(
-            logRotator(
-                numToKeepStr: '10',
-                artifactNumToKeepStr: '3'
-            )
-        )
-        ansiColor('xterm')
+    stage('Clone repository') {
+        checkout scm
     }
-    triggers {
-        cron('@weekly')
+    stage('Build Docker image') {
+        customImage = docker.build("demo-infra-jenkins-agent")
     }
-    stages {
-        stage('Clone repository') {
-            checkout scm
-        }
-        stage('Build Docker image') {
-            customImage = docker.build("demo-infra-jenkins-agent")
+    stage('Test Docker image') {
+        app.inside {
+            sh 'mvn'
         }
-        stage('Test Docker image') {
-            app.inside {
-                sh 'mvn'
-            }
-        }
-        stage('Push image') {
-            /* push image with two tags:
-             *  - the incremental build number from Jenkins;
-             *  - the 'latest' tag. */
-            docker.withRegistry('https://www.joaolino.com/nexus/repository/docker-public/', 'nexus-admin') {
-                customImage.push("${env.BUILD_NUMBER}")
-                customImage.push("latest")
-            }
+    }
+    stage('Push image') {
+        /* push image with two tags:
+         *  - the incremental build number from Jenkins;
+         *  - the 'latest' tag. */
+        docker.withRegistry('https://www.joaolino.com/nexus/repository/docker-public/', 'nexus-admin') {
+            customImage.push("${env.BUILD_NUMBER}")
+            customImage.push("latest")
         }
     }
 }
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