Abbreviated Jenkinsfile to build on multiple archs (from conan.io project)

Jenkinsfile.groovy

for (x in slaves) {
    def slave = x
    for (y in pyvers) {
        def pyver = y
        builders["${slave} - ${pyver}"] = {
            node(slave) {
                stage("${slave} - ${pyver}"){
                    step ([$class: 'WsCleanup'])
                    checkout scm
                    def bn = env.BUILD_NUMBER
                    ...

                    if(slave == "Linux"){
                        docker.image('lasote/conantests').inside("-e CONAN_USER_HOME=${WORKSPACE}") {
                            sh(script: "python ${runner} ${modules} ${pyver} ${branch} ${workdir} --num_cores=${numcores}")
                        }
                    }
                    else if(slave == "Windows"){
                        ...
                          withEnv(["CONAN_TEST_FOLDER=${workdir}"]){
                            bat(script: "python ${runner} ${modules} ${pyver} ${branch} \"${workdir}\" --num_cores=${numcores}")
                          }
                        ...
                    }
                    else if(slave == "Macos"){
                        ...
                          withEnv(['PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin']) {
                              sh(script: "python ${runner} ${modules} ${pyver} ${branch} ${workdir} --num_cores=${numcores}")
                          }
                        ...
                    }
                }
            }
        }
    }
}
parallel builders