add source code and readme

manifests/infrastructure/longhorn/recurring-job-s3-backup.yaml

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+---
+apiVersion: longhorn.io/v1beta2
+kind: RecurringJob
+metadata:
+  name: s3-backup-daily
+  namespace: longhorn-system
+spec:
+  cron: "0 2 * * *"  # Daily at 2 AM
+  task: "backup"
+  groups:
+  - longhorn-s3-backup
+  retain: 7  # Keep 7 daily backups
+  concurrency: 2  # Max 2 concurrent backup jobs
+  labels:
+    recurring-job: "s3-backup-daily"
+    backup-type: "daily"
+---
+apiVersion: longhorn.io/v1beta2
+kind: RecurringJob
+metadata:
+  name: s3-backup-weekly
+  namespace: longhorn-system
+spec:
+  cron: "0 1 * * 0"  # Weekly on Sunday at 1 AM
+  task: "backup"
+  groups:
+  - longhorn-s3-backup-weekly
+  retain: 4  # Keep 4 weekly backups
+  concurrency: 1  # Only 1 concurrent weekly backup
+  labels:
+    recurring-job: "s3-backup-weekly"
+    backup-type: "weekly"
+  parameters:
+    full-backup-interval: "1"  # Full backup every other week (alternating full/incremental)