Fix derp

vars/buildPodman.groovy

@@ -71,7 +71,9 @@ def call(Map config=[:]) {
 
         // generic clean
         stage('cleanup') {
-          sh 'make clean'
+          steps {
+            sh 'make clean'
+          }
 
           // Basic registry retention removing untagged images if not PR only
           when { not { changeRequest() } }