[v5.10.x] Set MySQL data source and product Helm Charts to use the same Storage Class

[chirangaalwis]

Description:
Currently, MySQL based data source Helm chart to use the same persistent storage class as in the case of the product Helm chart instead of checking for the default Kubernetes cluster Storage Class (see code).

Affected Product Version:
Helm Resources for WSO2 Identity Server version 5.10.0.1 and below

[chirangaalwis]

In the IAM chart this can be achieved by setting the Helm input values property mysql-is.mysql.persistence.storageClass to the desired Kubernetes Storage Class.

e.g. set the Kubernetes StorageClass to NFS Server Provisioner (using Helm version 3)

kubectl create ns <NAMESPACE>
helm install identity-server wso2/is-pattern-1 --set mysql-is.mysql.persistence.storageClass=nfs --namespace <NAMESPACE>

[chirangaalwis]

Fixed.