Dir Step doesn't work inside container step when dir is outside the workspace

#!/usr/bin/env groovy

 node {
   deleteDir()
   checkout scm

   def uniqueId = UUID.randomUUID().toString()
 
   stage('testing') {
     podTemplate(
       name: env.jaas_owner + '-jaas',
       label: uniqueId,
       containers: [
         containerTemplate(
           name: 'busybox',
           image: 'busybox',
           command: 'cat'
         )
       ]
     )
       {
         node(uniqueId) {
           container('busybox') {
             sh '''
             cd /var
             ls -al
             '''

             dir ('/var'){
               sh '''
               cd /var
               ls -al
               '''
             }
           }
         }
     }
   }
 }