change chart to align with cnpg's chart

charts/postgres-cluster/templates/_backup.tpl

@@ -0,0 +1,30 @@
+{{- define "cluster.backup" -}}
+{{- if .Values.backup.enabled }}
+backup:
+  retentionPolicy: {{ .Values.backup.retentionPolicy }}
+  barmanObjectStore:
+    destinationPath: "s3://{{ .Values.backup.endpointBucket }}/{{ .Values.kubernetesClusterName }}/postgresql/{{ .Release.Name }}"
+    endpointURL: {{ .Values.backup.endpointURL }}
+    {{- if .Values.backup.endpointCA }}
+    endpointCA:
+      name: {{ .Values.backup.endpointCA }}
+      key: ca-bundle.crt
+    {{- end }}
+    serverName: "postgresql-{{ .Release.Name }}-cluster-backup-index-{{ .Values.backup.backupIndex }}"
+    s3Credentials:
+      accessKeyId:
+        name: {{ include "cluster.backup.credentials" . }}
+        key: ACCESS_KEY_ID
+      secretAccessKey:
+        name: {{ include "cluster.backup.credentials" . }}
+        key: ACCESS_SECRET_KEY
+    wal:
+      compression: {{ .Values.backup.wal.compression }}
+      encryption: {{ .Values.backup.wal.encryption }}
+      maxParallel: {{ .Values.backup.wal.maxParallel }}
+    data:
+      compression: {{ .Values.backup.data.compression }}
+      encryption: {{ .Values.backup.data.encryption }}
+      jobs: {{ .Values.backup.data.jobs }}
+{{- end }}
+{{- end }}