add kubestash backup/restore

Signed-off-by: SK Ali Arman <[email protected]>

docs/guides/postgres/backup/kubestash/_index.md

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+---
+title: Backup & Restore PostgreSQL | KubeStash
+menu:
+  docs_{{ .version }}:
+    identifier: guides-pg-backup-stashv2
+    name: KubeStash (aka Stash 2.0)
+    parent: guides-pg-backup
+    weight: 50
+menu_name: docs_{{ .version }}
+---

docs/guides/postgres/backup/kubestash/application-level/examples/backupconfiguration.yaml

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+apiVersion: core.kubestash.com/v1alpha1
+kind: BackupConfiguration
+metadata:
+  name: sample-postgres-backup
+  namespace: demo
+spec:
+  target:
+    apiGroup: kubedb.com
+    kind: Postgres
+    namespace: demo
+    name: sample-postgres
+  backends:
+    - name: gcs-backend
+      storageRef:
+        namespace: demo
+        name: gcs-storage
+      retentionPolicy:
+        name: demo-retention
+        namespace: demo
+  sessions:
+    - name: frequent-backup
+      scheduler:
+        schedule: "*/5 * * * *"
+        jobTemplate:
+          backoffLimit: 1
+      repositories:
+        - name: gcs-postgres-repo
+          backend: gcs-backend
+          directory: /postgres
+          encryptionSecret:
+            name: encrypt-secret
+            namespace: demo
+      addon:
+        name: postgres-addon
+        tasks:
+          - name: manifest-backup
+          - name: logical-backup

docs/guides/postgres/backup/kubestash/application-level/examples/backupstorage.yaml

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+apiVersion: storage.kubestash.com/v1alpha1
+kind: BackupStorage
+metadata:
+  name: gcs-storage
+  namespace: demo
+spec:
+  storage:
+    provider: gcs
+    gcs:
+      bucket: kubestash-qa
+      prefix: demo
+      secretName: gcs-secret
+  usagePolicy:
+    allowedNamespaces:
+      from: All
+  default: true
+  deletionPolicy: Delete

docs/guides/postgres/backup/kubestash/application-level/examples/restoresession.yaml

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+apiVersion: core.kubestash.com/v1alpha1
+kind: RestoreSession
+metadata:
+  name: restore-sample-postgres
+  namespace: demo
+spec:
+  manifestOptions:
+    restoreNamespace: dev
+    postgres:
+      db: true
+  dataSource:
+    repository: gcs-postgres-repo
+    snapshot: latest
+    encryptionSecret:
+      name: encrypt-secret
+      namespace: demo
+  addon:
+    name: postgres-addon
+    tasks:
+      - name: logical-backup-restore
+      - name: manifest-restore

docs/guides/postgres/backup/kubestash/application-level/examples/retentionpolicy.yaml

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+apiVersion: storage.kubestash.com/v1alpha1
+kind: RetentionPolicy
+metadata:
+  name: demo-retention
+  namespace: demo
+spec:
+  default: true
+  failedSnapshots:
+    last: 2
+  maxRetentionPeriod: 2mo
+  successfulSnapshots:
+    last: 5
+  usagePolicy:
+    allowedNamespaces:
+      from: All

docs/guides/postgres/backup/kubestash/application-level/examples/sample-postgres.yaml

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+apiVersion: kubedb.com/v1
+kind: Postgres
+metadata:
+  name: sample-postgres
+  namespace: demo
+spec:
+  version: "16.1"
+  replicas: 3
+  standbyMode: Hot
+  streamingMode: Synchronous
+  storageType: Durable
+  storage:
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 1Gi
+  deletionPolicy: WipeOut