message: set limit to 28 days to keep old builds and artifacts
diff: @Library('SovrinHelpers') _
  +properties([
  + [$class: 'BuildDiscarderProperty', strategy: [
  + $class: 'LogRotator',
  + artifactDaysToKeepStr: '28',
  + artifactNumToKeepStr: '',
  + daysToKeepStr: '28',
  + numToKeepStr: ''
  + ]]
  +]);
  +
  try {
  testing()
  publishing()
  