democratic-csi: Enable volume resize

_democratic-csi_ can also dynamically resize Synology iSCSI LUNs when
PVC resource requests increase.  This requires enabling the external
resizer in the controller pod and marking the StorageClass as supporting
resize.

democratic-csi/democratic-csi.yaml

@@ -270,6 +270,34 @@ spec:
             fieldRef:
               apiVersion: v1
               fieldPath: metadata.name
+      - name: external-resizer
+        image: "registry.k8s.io/sig-storage/csi-resizer:v1.9.0"
+        args:
+        - --v=5
+        - --leader-election
+        - --leader-election-namespace=democratic-csi
+        - --timeout=90s
+        - --workers=10
+        - --csi-address=/csi-data/csi.sock
+        volumeMounts:
+        - mountPath: /csi-data
+          name: socket-dir
+        env:
+        - name: NODE_NAME
+          valueFrom:
+            fieldRef:
+              apiVersion: v1
+              fieldPath: spec.nodeName
+        - name: NAMESPACE
+          valueFrom:
+            fieldRef:
+              apiVersion: v1
+              fieldPath: metadata.namespace
+        - name: POD_NAME
+          valueFrom:
+            fieldRef:
+              apiVersion: v1
+              fieldPath: metadata.name
       # https://github.com/kubernetes-csi/external-snapshotter
       # beware upgrading version:
       #  - https://github.com/rook/rook/issues/4178

democratic-csi/storageclass.yaml

@@ -2,6 +2,7 @@ apiVersion: storage.k8s.io/v1
 kind: StorageClass
 metadata:
   name: synology-iscsi
+allowVolumeExpansion: true
 provisioner: org.democratic-csi.iscsi-synology
 parameters:
   fsType: xfs