Hopefully fix docker complaining about nonsense

jenkins/Jenkinsfile

@@ -29,11 +29,7 @@ pipeline {
         stage('Prepare buildx') {
             steps {
                 sh """
-                  docker run --privileged --rm tonistiigi/binfmt --install all
+                  docker buildx create --name $BUILDER_NAME
-                  
-                  docker context create $BUILDER_NAME
-                  docker context use $BUILDER_NAME
-                  docker buildx create $BUILDER_NAME
                   docker buildx use $BUILDER_NAME
                   docker buildx inspect --bootstrap
                 """
@@ -77,10 +73,7 @@ pipeline {
     post {
         always {
             // cleanup
-            sh """
+            sh 'docker buildx rm $BUILDER_NAME'
-              docker context rm -f $BUILDER_NAME
-              docker buildx use default
-            """
         }
     }