ERPNext helm chart upgrade to version 8

[atalakey4work]

During the upgrade from chart version 7 to 8 we are facing the following issues:

1. Due to a new alias, existing mariadb statefulset name has changes from mariadb to mariadb-subchart leading to a new empty PVC created.
2. bench restore does not have the new flags (i.e. --db-host, --db-port).

Note that I am using a custom ERPNext image base on the below:

https://github.com/frappe/frappe_docker/blob/main/images/layered/Containerfile

[ismxilxrif]

try to update the site config to the newest service name, and bench restore to the sql dump file of the old db service