Add support for separate signature registry than the image

[samj1912]

cosign supports uploading signatures to a separate registry than the image itself.

cosigned should be able to support something similar when uploading the public key config map to associate each keys with a registry?

[dlorenc]

Sure! We can use the same env car as config somehow.

[samj1912]

I might try and contribute this :)

[dlorenc]

Sure! Just curious - are you thinking of running this anywhere? I really only put it together as a quick demo/POC, but it appears that some people are actually looking at it seriously :)

[samj1912]

If it supports this and #6, definitely. It might be worth considering to promote this repository or something like it to the sigstore project. I believe other people who are using cosign will probably be interested in something like this as well :)

[dlorenc]

Yeah that's mainly what I was getting at! We can find some kind of org to move this to if people are really interested in it :)