PostgreSQL database isn't created automatically in kubernetes deployment

Question

I want to deploy my postgreSQL database with kubernetes but the database is not created...I put POSTGRES_DB in env of the deployment.

the kubernetes deployment of postgres work very well but no "qr_auth" database created.

deployment:

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgres-deployment
  labels:
    app: postgres
spec:
  serviceName: "postgres-service"
  replicas: 1
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
      - name: postgres
        image: postgres:17.4
        env:
          - name: POSTGRES_PASSWORD
            valueFrom:
              secretKeyRef:
                name: qr-auth-secret
                key: DB_PASSWORD
          - name: POSTGRES_USER
            valueFrom:
              secretKeyRef:
                name: qr-auth-secret
                key: DB_USER
          - name: POSTGRES_DB 
            value: qr_auth
        resources:
          requests:
            memory: "256Mi"
            cpu: "250m"
          limits:
            memory: "512Mi"
            cpu: "1000m"
        ports:
        - containerPort: 5432
        volumeMounts:
        - name: postgres-storage
          mountPath: /var/lib/postgresql/data
  volumeClaimTemplates:
  - metadata:
      name: postgres-storage
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 5Gi

---

apiVersion: v1
kind: Service
metadata:
  name: postgres-service
spec:
  selector:
    app: postgres
  ports:
  - port: 5432
    targetPort: 5432

configmap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: qr-auth-config
data:
  DB_HOST: "postgres-service"
  DB_PORT: "5432"
  DB_NAME: "qr_auth"

secret:

apiVersion: v1
kind: Secret
metadata:
  name: qr-auth-secret
type: Opaque
data:
  DB_USER: cG9zdGdyZXM=  # postgres en base64
  DB_PASSWORD: cm9vdA==  # root en base64