Update to include image verification

[fr0gger03]

With the availability of Docker Hardened Images, I would like to be able to verify an image when pulled as part of a pipeline. There are new scout commands for "docker scout attest get" and "docker scout attest list" that can be used for this purpose.

I think this should include the ability to:

• retrieve all attestations
• retrieve specific attestations
• validate and show equivalent cosign command

Documentation link: https://docs.docker.com/dhi/how-to/verify/