Add option to have MariaDB backups encrypted

[The0mikkel]

Update the MariaDB backup implementation, to support the new encryption of backups, which were introduced in MariaDB operator v25.10.3.

Along with updating MariaDB backup implementation, the encryption key system needs to be implemented and the key needs to be customizable or retrievable.

Tasks

• Update MariaDB to v25.10.3
• Add encryption key configuration
• Add documentation on encrypted backups
• Add documentation on how to restore with encrypted backups
  • In CTF Pilot ecosystem
  • On standalone server
• Optional: Allow for disabling/enabling encryption