like an existing PersistentVolumeClaim.

First, create the secret:

```bash
kubectl create secret generic my-minio-secret --from-literal=rootUser=foobarbaz --from-literal=rootPassword=foobarbazqux
```

Then install the chart, specifying that you want to use an existing secret:

```bash
helm install --set existingSecret=my-minio-secret minio/minio
```