How to resolve init_db / permission denied error on Postgres cluster on Kubernetes?

I installed Crunchydata Postgres Operator on K8S by following this link

I found the following link to create PG Cluster using postgres-cluster.yaml link

When I try to create the Postgres cluster using

kubectl create -f postgres-cluster.yml

it errored with the following

[root@ontrol01 ~]# kubectl logs -n pgo deployment.apps/hippo | more
/opt/crunchy/bin/postgres-ha/bootstrap-postgres-ha.sh: line 198: /pgdata/hippo.initial
izing: Permission denied
initdb: error: could not create directory "/pgdata/hippo": Permission denied
pg_ctl: database system initialization failed

I tried by adding the "securitycontext" to postgres-cluster.yaml (tailored output) but it does not work. I might be wrong here

apiVersion: crunchydata.com/v1
kind: Pgcluster
metadata:
  annotations:
    current-primary: hippo
  labels:
    crunchy-pgha-scope: hippo
    deployment-name: hippo
    name: hippo
    pg-cluster: hippo
    pgo-version: 4.6.2
    pgouser: admin
  name: hippo
  namespace: pgo
spec:
  securityContext:
    runAsUser: 0
    runAsGroup: 0

I am able to find similar issue in SO but I am not sure what should be added where to fix the postgres permission denied issue