archive-staging: Configure the ephemeral /tmp volume template configuration

Related to infra/sysadm-environment#4676

For production:

      volumes:
      - name: localstorage
        emptyDir: {}

For staging:

      volumes:
      - name: localstorage
        ephemeral:
          volumeClaimTemplate:
            metadata:
              labels:
                type: ephemeral-volume
            spec:
              accessModes:
              - ReadWriteOnce
              resources:
                requests:
                  storage: 100Gi
              storageClassName: local-path

/cc @teams/sysadmin