Implement Maven mirrors

[schnatterer]

Can be tested with the GitOps Playground for example:

http://scmm.localhost/scm/repo/argocd/petclinic-plain/code/sources/main/Jenkinsfile/

Then change these lines:

String getCesBuildLibRepo() { "https://github.com/cloudogu/ces-build-lib/" }
String getCesBuildLibVersion() { '7e7e858' }


//. ..
node {

    mvn = cesBuildLib.MavenWrapper.new(this)
    mvn.useMirrors([name: 'google-maven', mirrorOf: 'central', url: 'https://maven-central.storage.googleapis.com/maven2/'])
    
    catchError {

        stage('Checkout') {
            checkout scm
        }

        stage('Build') {
            mvn 'clean package -DskipTests -Dcheckstyle.skip'
            archiveArtifacts artifacts: '**/target/*.jar'
        }
    
// ... def loadLibraries() 

    cesBuildLib = library(identifier: "ces-build-lib@${cesBuildLibVersion}",
            retriever: modernSCM([$class: 'GitSCMSource', remote: cesBuildLibRepo])
    ).com.cloudogu.ces.cesbuildlib

Then start a build on Jenkins: http://jenkins.localhost/job/example-apps/job/petclinic-plain/job/main/build?delay=0sec

An in the logs of this build you will see the mirror in action