feat: Add option to provision StorageClasses

Most application charts don't usually create `StorageClass`es. They create PVCs. This is extending the work done in #274. The chart itself is kind of broken unless `image.tag` is set to "master". #291 will probably address that.

helm/templates/storageclass.yaml

@@ -0,0 +1,15 @@
+{{- range .Values.storageClasses }}
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: {{ .name }}
+provisioner: efs.csi.aws.com
+{{- with .mountOptions }}
+mountOptions: 
+{{ toYaml . }}
+{{- end }}
+{{- with .parameters }}
+parameters:
+{{ toYaml . | indent 2 }}
+{{- end }}
+{{- end }}

helm/values.yaml

@@ -75,3 +75,16 @@ serviceAccount:
   ## Enable if EKS IAM for SA is used
   #  eks.amazonaws.com/role-arn: arn:aws:iam::111122223333:role/efs-csi-role
   name: efs-csi-controller-sa
+
+storageClasses: []
+# Add StorageClass resources like:
+# - name: efs-sc
+#   mountOptions:
+#   - tls
+#   parameters:
+#     provisioningMode: efs-ap
+#     fileSystemId: fs-92107410
+#     directoryPerms: "700"
+#     gidRangeStart: "1000"
+#     gidRangeEnd: "2000"
+#     basePath: "/dynamic_provisioning"