Add druid kubestash backup docs

Signed-off-by: Tapajit Chandra Paul <[email protected]>

docs/guides/druid/backup/_index.md

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

docs/guides/druid/backup/logical/examples/backupconfiguration.yaml

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+apiVersion: core.kubestash.com/v1alpha1
+kind: BackupConfiguration
+metadata:
+  name: sample-mysql-backup
+  namespace: demo
+spec:
+  target:
+    apiGroup: kubedb.com
+    kind: MySQL
+    namespace: demo
+    name: sample-mysql
+  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-mysql-repo
+          backend: gcs-backend
+          directory: /mysql
+          encryptionSecret:
+            name: encrypt-secret
+            namespace: demo
+      addon:
+        name: mysql-addon
+        tasks:
+          - name: logical-backup

docs/guides/druid/backup/logical/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/druid/backup/logical/examples/restored-mysql.yaml

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+apiVersion: kubedb.com/v1
+kind: MySQL
+metadata:
+  name: restored-mysql
+  namespace: demo
+spec:
+  init:
+    waitForInitialRestore: true
+  version: "8.2.0"
+  replicas: 3
+  topology:
+    mode: GroupReplication
+  storageType: Durable
+  storage:
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 50Mi
+  deletionPolicy: WipeOut

docs/guides/druid/backup/logical/examples/restoresession.yaml

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+apiVersion: core.kubestash.com/v1alpha1
+kind: RestoreSession
+metadata:
+  name: restore-sample-mysql
+  namespace: demo
+spec:
+  target:
+    apiGroup: kubedb.com
+    kind: MySQL
+    namespace: demo
+    name: restored-mysql
+  dataSource:
+    repository: gcs-mysql-repo
+    snapshot: latest
+    encryptionSecret:
+      name: encrypt-secret
+      namespace: demo
+  addon:
+    name: mysql-addon
+    tasks:
+      - name: logical-backup-restore

docs/guides/druid/backup/logical/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/druid/backup/logical/examples/sample-mysql.yaml

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+apiVersion: kubedb.com/v1
+kind: MySQL
+metadata:
+  name: sample-mysql
+  namespace: demo
+spec:
+  version: "8.2.0"
+  replicas: 3
+  topology:
+    mode: GroupReplication
+  storageType: Durable
+  storage:
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 50Mi
+  deletionPolicy: WipeOut