Adds `fsGroup` to the S3 backup cronjob's security context to ensure proper volume ownership. Increases the SSH key secret's `defaultMode` to grant group read access, resolving permission failures when reading the SSH key.
Introduces a daily Kubernetes CronJob that utilizes rclone to perform compressed backups of oCIS S3 data to a Hetzner Storage Box via SFTP.
This new backup mechanism requires the manual creation of an 'ocis-storagebox-credentials' secret, which holds the Storage Box host, user, and SSH private key. A check is added to the secret initialization job to ensure this essential external secret exists.