Draft: Test cosign add

~/code/CNG/gitlab-base % pwd
/Users/samroque-worcel/code/CNG/gitlab-base
~/code/CNG/gitlab-base % docker build -t test . && docker run -it docker.io/library/test bash
[...]
 => => naming to docker.io/library/test                                                                                                                                 
root@45dbb01e0a4e:/# cosign
A tool for Container Signing, Verification and Storage in an OCI registry.

Usage:
cosign [command]

[...]