GPG image signing : extract signer ID from signature files ?

[nipil]

I am using GPG signing and verification using GPG keys, policy.json and registry.yaml files. Everything works well.

I need to "audit/inventory" who signed what, and to be able to "retire" some signatures too.

But there is no information available from the file/folder names only.

Question : how can i "extract" the signing GPG "id" from the generated signature files ?

Thanks in advance

[nipil]

Anyone would have any idea ?