K8s storage: EmptyDir

extraVolumes:
 - name: extras
   emptyDir: {}

extraVolumeMounts:
 - name: extras
   mountPath: /usr/share/extras
   readOnly: true

kubectl get psp
Warning: policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+
NAME                    PRIV    CAPS   SELINUX    RUNASUSER   FSGROUP    SUPGROUP   READONLYROOTFS   VOLUMES
gce.gke-metrics-agent   false          RunAsAny   RunAsAny    RunAsAny   RunAsAny   false            hostPath,secret,configMap
grafana                 false          RunAsAny   RunAsAny    RunAsAny   RunAsAny   false            configMap,emptyDir,projected,secret,downwardAPI,persistentVolumeClaim