Can you explain the concept of Sealed Secret in Kubernetes and how it is used for secure storage of secret data?

Sealed Secret is a mechanism in Kubernetes for securely storing and managing secrets. It allows encrypting secret data locally by creating a SealedSecret object, which can be safely stored in a code repository.

Process:

1. You create a regular Kubernetes Secret with sensitive data.
2. Using the Sealed Secrets controller, this secret is encrypted with a public key and transformed into a SealedSecret.
3. The SealedSecret can be safely stored in Git or another storage.
4. The controller in the cluster decrypts the SealedSecret using a private key and creates a regular Secret in Kubernetes.

This ensures security: secrets are not stored in plain text in the repository but are automatically deployed in the cluster.