add postgres-cluster-upgrade chart

charts/postgres-cluster-upgrade/templates/backup.yaml

@@ -0,0 +1,17 @@
+{{- if .Values.backup.inititeBackup }}
+apiVersion: postgresql.cnpg.io/v1
+kind: Backup
+metadata:
+  name: "postgresql-{{ .Release.Name }}-cluster-upgrade-backup"
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: "postgresql-{{ .Release.Name }}-cluster-upgrade-backup"
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/version: {{ .Chart.AppVersion }}
+    app.kubernetes.io/component: database
+    app.kubernetes.io/part-of: {{ .Release.Name }}
+spec:
+  method: barmanObjectStore
+  cluster:
+    name: "postgresql-{{ .Release.Name }}-cluster-upgrade"
+{{- end }}