Generate job artifacts in an initContainer and export the files to workstation afterwards.

export-files-job.yaml

# Allows copying of job files to local after execution. Example copy command:
#
#   kubectl apply -f ./export-file-job.yaml
#   POD=$(kubectl get pod --selector=job-name=export-files -o jsonpath='{.items[0].metadata.name}')
#   kubectl wait pod/$POD --for=condition=ready
#   until kubectl logs $POD | grep 'Ready for download'; do sleep 2; done
#   kubectl cp $POD:files.zip ./job-files-$(date +"%Y%m%d%H%M").zip
#
# Another option would be for the `export-files` container to be a webserver to
# serve of the artifact files to be downloaded with `kubectl port-forward ...`.

apiVersion: batch/v1
kind: Job
metadata:
  name: export-files
spec:
  template:
    metadata:
      labels:
        job-name: export-files
    spec:
      restartPolicy: Never
      volumes:
        - name: job-files
          emptyDir: {}
      initContainers:
        - name: job
          image: alpine
          volumeMounts:
            - name: job-files
              mountPath: /job
          workingDir: /job
          command: [/bin/sh, -c]
          args:
            - |
              echo "This is where your job would happen. The log from this job is"
              echo "is visible with 'kubectl logs POD job'."

              echo "Imagine the files below are generated from the job."
              echo contents of a file I want from a job container > ./file-1.txt
              date > ./file-2.txt
              hostname > ./file-3.txt

              echo "Zipping job files"
              apk add --quiet --no-cache zip
              zip -v ./files.zip $(find . -type f)
              ls -alh ./files.zip

              echo "Now this initContainer will exit and the container below will start"
              echo "and sit idle so that these job files can be cp'd out of the pod."
      containers:
        - name: export-files
          image: alpine
          volumeMounts:
            - name: job-files
              mountPath: /job
          workingDir: /job
          command: [/bin/sh, -c]
          args:
            - |
              echo "Ready for download"
              echo "Sleeping to allow files to be exported with 'kubectl cp'"
              sleep 1m
              echo "Exiting"