Adding multi-stage Docker file

Dockerfile

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+FROM maven:3.6.3-jdk-11-slim as build
+WORKDIR /opt/demo
+COPY . /opt/demo
+RUN mvn package -D skipTests
+
+FROM tomcat as run
+WORKDIR /usr/local/tomcat
+COPY --from=build /opt/demo/target/sysfoo.war webapps/ROOT.war
+

Jenkinsfile

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+pipeline {
+  agent none
+  stages {
+    stage('Build') {
+      agent {
+        docker {
+          image 'maven:3.6.3-jdk-11-slim'
+        }
+
+      }
+      steps {
+        sh 'mvn compile'
+      }
+    }
+
+    stage('Test') {
+      agent {
+        docker {
+          image 'maven:3.6.3-jdk-11-slim'
+        }
+
+      }
+      steps {
+        sh 'mvn clean test'
+      }
+    }
+
+    stage('Package') {
+      when {
+        branch 'master'
+      }
+      parallel {
+        stage('Package') {
+          agent {
+            docker {
+              image 'maven:3.6.3-jdk-11-slim'
+            }
+
+          }
+          steps {
+            sh 'mvn package -DskipTests'
+            archiveArtifacts 'target/*.war'
+          }
+        }
+
+        stage('DockerBnP') {
+          agent any
+          steps {
+            script {
+              docker.withRegistry('https://index.docker.io/v1/', 'dockerlogin') {
+                def dockerImage = docker.build("paragsin/sysfoo:v${env.BUILD_ID}", "./")
+                dockerImage.push()
+                dockerImage.push("latest")
+                dockerImage.push("dev")
+              }
+            }
+
+          }
+        }
+
+      }
+    }
+
+  }
+  triggers {
+    pollSCM('H/2 * * * *')
+  }
+}

README.md

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 This is a Sample Maven App. 
+
+Test 01: Adding Test line.
+Test 02: Add test line, and create pull request to protected master.

src/test.txt

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+Adding text file