Disable concurrent builds, enable s390x

Jenkinsfile

@@ -1,8 +1,5 @@
 #!/usr/bin/env groovy
 
-// Only one build running at a time, stop prior build if new build starts
-def buildNumber = BUILD_NUMBER as int; if (buildNumber > 1) milestone(buildNumber - 1); milestone(buildNumber) // Thanks to jglick
-
 /*
  * Making sure that we can follow the steps necessary to install the latest
  * release for Debian/Ubuntu machine.
@@ -11,10 +8,14 @@ def buildNumber = BUILD_NUMBER as int; if (buildNumber > 1) milestone(buildNumbe
 properties([
     buildDiscarder(logRotator(numToKeepStr: '5')),
     pipelineTriggers([cron('@hourly')]),
+    // Only one build running at a time, stop prior build if new build starts
+    disableConcurrentBuilds(abortPrevious: true),
+    // Do not resume build after controller restart
+    disableResume(),
 ])
 
 // Define processors
-def Processors = [ "arm64docker", "docker" ] // "ppc64ledocker", "s390xdocker" excluded because test machine cannot download the jenkins package
+def Processors = [ "arm64docker", "s390xdocker", "docker" ] // "ppc64ledocker", excluded because test machine cannot download the jenkins package
 
 // Generate a parallel step for each label in labels
 def generateParallelSteps(labels) {