This feature addresses the digital signing process for docker/container images for the SBC. Only the Jenkins stream/builds are signed in this feature. Use 'notation' to sign the container images digitally. Notation is an open-source container image signer used to sign and verify container images to secure the Supply of any deliverable, such as container images, SBOMs, and other blob attachments. Check the keys in the workspace in this phase to secure the deployment of Kubernetes.