Resolve "Database PVC creation should be optional"

Closes #99 (closed)

helmchart/single-sign-on/templates/pvc-kratos-database.yaml

-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: single-sign-on-database
-spec:
-  accessModes:
-    - ReadWriteOnce
-  volumeMode: Filesystem
-  resources:
-    requests:
-      storage: 1Gi
-  storageClassName: local-path
-
-