Set default fstype to fix fsGroup usage

The provisioner sidecar v2 dropped setting a default file-system type.
When we upgraded, we did not set it explicitly because our driver
already handles the case where no file-system is specified. As it turns
out, however, the kubelet gates the application of the fsGroup security
context parameter setting the file permissions of a volume on the
available of a file-system at the time the PV is created and otherwise
ignores it.

We restore proper functionality of fsGroup by setting the default
file-system type to ext4.

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## unreleased
 
+* Fix fstype usage
+  [[GH-362]](https://github.com/digitalocean/csi-digitalocean/pull/362)
 * Match csi-provisioner RBAC rules with upstream
   [[GH-360]](https://github.com/digitalocean/csi-digitalocean/pull/360)
 

deploy/kubernetes/releases/csi-digitalocean-dev/driver.yaml

@@ -79,6 +79,7 @@ spec:
           image: quay.io/k8scsi/csi-provisioner:v2.0.2
           args:
             - "--csi-address=$(ADDRESS)"
+            - "--default-fstype=ext4"
             - "--v=5"
           env:
             - name: ADDRESS