Use persistent disk on non-GCP deploys

[batpad]

Currently, we have persistent disk configuration to work with GCE persistent disks: https://github.com/developmentseed/osm-seed/blob/develop/helm/osm-seed/templates/db-pd.yaml#L17

We need to add an option in values.yaml which specifies the cloud provider - like gcp, aws (and in the future none / self) and accordingly configures persistent storage for the specified target.

I will do research on specifying persistent storage on AWS with EKS and then make the required changes to conditionally handle setting up of the persistent disk.

cc @Rub21 @olafveerman

[Rub21]

We added the cloudProvider variable it could be minukube, aws or gcp ,

osm-seed/helm/osm-seed/values.yaml

Line 10 in ed89ef7

cloudProvider: minukube

,