stable/drupal refers to bitnami chart.
Install with the default values (+ mandatory fields that are required): helm install d8cluster stable/drupal --set mariadb.rootUser.password=password,mariadb.db.password=secretpassword.
Wait for the pods to be created: kubectl get pods.
You should be able to access your new Drupal installation through drupal.local and log with username = "user" and password = kubectl get secret --namespace default d8cluster-drupal -o jsonpath="{.data.drupal-password}" | base64 --decode.
If drupal.local doesn't work, look at the services state and see if the public ip of the LoadBalancer is defined. If you're on MiniKube it may be undefined, in this case look at minikube services minikube service d8cluster-drupal --url and open the link in the URL.
- Article from Jeff Geerling on Running Drupal in Kubernetes with Docker in production April 12, 2019