Consegue me passar o seu statefulset.yaml fazendo um favor?
 
  
esse seria meu codigo caso queira testar
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: statefulset-mysql
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: mysql-server
      name: mysql
    spec:
      containers:
    - name: container-mysql
      image: mysql:5.5
      ports:
        - containerPort: 3306
      env:
        - name: MYSQL_DATABASE
          value: "loja"
        - name: MYSQL_USER
          value: "root"
        - name: MYSQL_ALLOW_EMPTY_PASSWORD
          value: "1"
      volumeMounts:
        - name: volume-mysql
          mountPath: /var/lib/mysql
  volumes:
   - name: volume-mysql
     persistentVolumeClaim:
       claimName: configuracao-mysql
selector:
  matchLabels:
    app: mysql-server