Groovy Jenkins Pipeline

Coffee-Service, Food-Service: Jenkinsfile
def pipeline
stage('Load pipeline') {
    //  Load the pipeline from the shared repository
    fileLoader.withGit(
    'https://url-to-pipeline-repo.git',
    'master',
    ' id-of-in-jenkins-stored-credentials') {
        //  Every service is able to use pipeline.groovy
        pipeline = fileLoader.load('pipeline.groovy')
    }
}
pipeline.execute()
Pipeline Repo: pipeline.groovy

def execute() {
    stage('Checkout') {
        checkout scm
    }
    stage('Build service') {
        sh "mvn clean install"
    }
    // The variable env.BRANCH_NAME is automatically set to the current branch.
    // As a consequence of this feature the pipeline can deal with every new branch
    if ("develop".equals(env.BRANCH_NAME) {
        stage('Release') {
            sh "mvn release:prepare release:perform"
        }
    }
}