What specific tool is used to digitally sign Docker images, enabling content trust and allowing for verification of their origin and integrity when pushed to a registry?

The specific command-line tool used to digitally sign Docker images, enabling content trust and allowing for verification of their origin and integrity when pushed to a registry, is `docker trust`. This tool is part of the Docker client and provides the user interface for interacting with Docker Content Trust. Digitally signing a Docker image means creating a cryptographic signature for it. This signature is generated using a publisher's private key and is tied to the image's unique content identifier, known as its image digest. The purpose of this signature is twofold: to prove the origin of the image by demonstrating it was signed by a specific, trusted publisher, and t....