Non-root non-persistent postgresql container in kubernetes

postgresql.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: postgres
spec:
  selector:
    app: postgres
  ports:
  - port: 5432
    targetPort: 5432
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres
spec:
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      securityContext:
        runAsUser: 999 # See https://github.com/docker-library/postgres/blob/bfc5d81c8f5647c690f452dc558e64fddb1802f6/10/Dockerfile
        runAsGroup: 999
        fsGroup: 999
      containers:
        - name: postgres
          image: postgres:13
          resources:
            limits:
              memory: "500Mi"
              cpu: "500m"
            requests:
              memory: "500Mi"
              cpu: "500m"
          ports:
            - containerPort: 5432
          env:
            - name: PGDATA
              value: /var/lib/postgresql/data/pgdata
            - name: POSTGRES_PASSWORD
              value: postgres
            - name: POSTGRES_USERNAME
              value: postgres