Add zookeeper kubestash backup docs

Signed-off-by: Rudro-25 <[email protected]>

docs/guides/zookeeper/backup/_index.md

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+---
+title: Backup & Restore ZooKeeper
+menu:
+  docs_{{ .version }}:
+    identifier: guides-zk-backup
+    name: Backup & Restore
+    parent: zk-zookeeper-guides
+    weight: 40
+menu_name: docs_{{ .version }}
+---

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

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

docs/guides/zookeeper/backup/kubestash/auto-backup/examples/backupstorage.yaml

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+apiVersion: storage.kubestash.com/v1alpha1
+kind: BackupStorage
+metadata:
+  name: s3-storage
+  namespace: demo
+spec:
+  storage:
+    provider: s3
+    s3:
+      endpoint: ap-south-1.linodeobjects.com
+      bucket: rudro
+      region: ap-south-1
+      prefix: blueprint
+      secretName: s3-secret
+  usagePolicy:
+    allowedNamespaces:
+      from: All
+  deletionPolicy: WipeOut

docs/guides/zookeeper/backup/kubestash/auto-backup/examples/customize-backupblueprint.yaml

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+apiVersion: core.kubestash.com/v1alpha1
+kind: BackupBlueprint
+metadata:
+  name: zookeeper-customize-backup-blueprint
+  namespace: demo
+spec:
+  usagePolicy:
+    allowedNamespaces:
+      from: Same
+  backupConfigurationTemplate:
+    deletionPolicy: OnDelete
+    backends:
+      - name: s3-backend
+        storageRef:
+          namespace: demo
+          name: s3-storage
+        retentionPolicy:
+          name: demo-retention
+          namespace: demo
+    sessions:
+      - name: frequent-backup
+        sessionHistoryLimit: 3
+        scheduler:
+          schedule: ${schedule}
+          jobTemplate:
+            backoffLimit: 1
+        repositories:
+          - name: ${repoName}
+            backend: s3-backend
+            directory: ${namespace}/${targetName}
+            encryptionSecret:
+              name: encrypt-secret
+              namespace: demo
+        addon:
+          name: zookeeper-addon
+          tasks:
+            - name: logical-backup

docs/guides/zookeeper/backup/kubestash/auto-backup/examples/default-backupblueprint.yaml

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+apiVersion: core.kubestash.com/v1alpha1
+kind: BackupBlueprint
+metadata:
+  name: zookeeper-default-backup-blueprint
+  namespace: demo
+spec:
+  usagePolicy:
+    allowedNamespaces:
+      from: Same
+  backupConfigurationTemplate:
+    deletionPolicy: OnDelete
+    backends:
+      - name: s3-backend
+        storageRef:
+          namespace: demo
+          name: s3-storage
+        retentionPolicy:
+          name: demo-retention
+          namespace: demo
+    sessions:
+      - name: frequent-backup
+        sessionHistoryLimit: 3
+        scheduler:
+          schedule: "*/5 * * * *"
+          jobTemplate:
+            backoffLimit: 1
+        repositories:
+          - name: default-blueprint
+            backend: s3-backend
+            directory: /default-blueprint
+            encryptionSecret:
+              name: encrypt-secret
+              namespace: demo
+        addon:
+          name: zookeeper-addon
+          tasks:
+            - name: logical-backup

docs/guides/zookeeper/backup/kubestash/auto-backup/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: Same

docs/guides/zookeeper/backup/kubestash/auto-backup/examples/sample-zookeeper-2.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: ZooKeeper
+metadata:
+  name: sample-zookeeper-2
+  namespace: demo
+  annotations:
+    blueprint.kubestash.com/name: zookeeper-customize-backup-blueprint
+    blueprint.kubestash.com/namespace: demo
+    variables.kubestash.com/schedule: "*/10 * * * *"
+    variables.kubestash.com/repoName: customize-blueprint
+    variables.kubestash.com/namespace: demo
+    variables.kubestash.com/targetName: sample-zookeeper-2
+    variables.kubestash.com/targetedDatabase: zookeeper
+spec:
+  version: "3.8.3"
+  adminServerPort: 8080
+  replicas: 3
+  storage:
+    resources:
+      requests:
+        storage: "1Gi"
+    accessModes:
+      - ReadWriteOnce
+  deletionPolicy: "WipeOut"

docs/guides/zookeeper/backup/kubestash/auto-backup/examples/sample-zookeeper.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: ZooKeeper
+metadata:
+  name: sample-zookeeper
+  namespace: demo
+  annotations:
+    blueprint.kubestash.com/name: zookeeper-default-backup-blueprint
+    blueprint.kubestash.com/namespace: demo
+spec:
+  version: "3.8.3"
+  adminServerPort: 8080
+  replicas: 3
+  storage:
+    resources:
+      requests:
+        storage: "1Gi"
+    accessModes:
+      - ReadWriteOnce
+  deletionPolicy: "WipeOut"