[stable/sonarqube] configure persistence defaults (#18716)

This makes it easier to use persistence. As all one needs to do is to
set `persistence.enabled` to `true`

It's still possible to override it with other settings if the user wants
to.

Reasoning for the values:
- `accessMode` needs to be defined anyhow as the template uses it when
   rendering the PVC
- `storageClass` of empty uses the default storage class of the cluster
- `size` 10Gi - just a default values

Signed-off-by: Torsten Walter <torsten.walter@syncier.com>

stable/sonarqube/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: sonarqube
 description: Sonarqube is an open sourced code quality scanning tool
-version: 3.2.4
+version: 3.2.5
 appVersion: 7.9.1
 keywords:
   - coverage

stable/sonarqube/README.md

@@ -66,9 +66,9 @@ The following table lists the configurable parameters of the Sonarqube chart and
 | `persistence.enabled`                       | Flag for enabling persistent storage      | false                                      |
 | `persistence.annotations`                   | Kubernetes pvc annotations                | `{}`                                      |
 | `persistence.existingClaim`                 | Do not create a new PVC but use this one  | None                                       |
-| `persistence.storageClass`                  | Storage class to be used                  | "-"                                        |
+| `persistence.storageClass`                  | Storage class to be used                  | ""                                         |
 | `persistence.accessMode`                    | Volumes access mode to be set             | `ReadWriteOnce`                            |
-| `persistence.size`                          | Size of the volume                        | None                                     |
+| `persistence.size`                          | Size of the volume                        | 10Gi                                       |
 | `sonarProperties`                           | Custom `sonar.properties` file            | None                                       |
 | `sonarSecretProperties`                     | Additional `sonar.properties` file to load from a secret | None                                       |
 | `customCerts.enabled`                       | Use `customCerts.secretName`              | false                                      |

stable/sonarqube/values.yaml

@@ -126,9 +126,9 @@ persistence:
   ##   set, choosing the default provisioner.  (gp2 on AWS, standard on
   ##   GKE, AWS & OpenStack)
   ##
-  # storageClass: "-"
-  # accessMode: ReadWriteOnce
-  # size: 10Gi
+  storageClass:
+  accessMode: ReadWriteOnce
+  size: 10Gi
 
 # List of plugins to install.
 # For example: