Update Jenkinsfile

Jenkinsfile

@@ -79,14 +79,14 @@ pipeline {
                             //builds.each{ k, v -> echo ("push ${k}") } //for local testing
                             // builds.each{ k, v -> v.push(k) } <- not used anymore
 
+                            // the following command needs to be run first on a new node, but not after that
+                            sh 'docker buildx create --use --name multiarch --append'
                             EXERCISE_FOLDERS.each { exercise, folder ->
                                 // old non multi-arch way
                                 // def build = docker.build("${maintainer}/${imagename}:${exercise}-${tag}", "--no-cache --pull --build-arg VERSION_TAG=${tag} ${folder}")
                                 // build.push("${exercise}-${tag}")
 
                                 // switch to buildx, which is not supported by the jenkins docker plugin
-                                // the following command needs to be run first on a new node, but not after that
-                                // sh 'docker buildx create --use --name multiarch --append'
                                 sh 'docker buildx inspect --bootstrap'
                                 sh 'docker buildx ls'
                                 sh 'docker login -u tieradmin -p $DOCKERHUBPW'