Add logical backup (#442)

* Add k8s cron job to spawn logical backups

* Minor doc updates

charts/postgres-operator/templates/clusterrole.yaml

@@ -141,4 +141,15 @@ rules:
   - bind
   resourceNames:
   - {{ template "postgres-operator.fullname" . }}
+- apiGroups:
+  - batch
+  resources:
+  - cronjobs # enables logical backups
+  verbs:
+  - create
+  - delete
+  - get
+  - list
+  - patch
+  - update
 {{ end }}

charts/postgres-operator/values.yaml

@@ -62,6 +62,9 @@ config:
   pod_management_policy: "ordered_ready"
   enable_pod_antiaffinity: "false"
   pod_antiaffinity_topology_key: "kubernetes.io/hostname"
+  logical_backup_schedule: "30 00 * * *"
+  logical_backup_docker_image: "registry.opensource.zalan.do/acid/logical-backup"
+  logical_backup_s3_bucket: ""
 rbac:
   # Specifies whether RBAC resources should be created
   create: true