We'd like to implement image signing for our imagestreams. We are unable to use 
`atomic cli` or skopeo to sign the images since we support other OS's and not 
just rpm based distros. 

There seems to be a way to write signatures using the registry API as written 
here:

https://docs.openshift.com/container-platform/3.9/admin_guide/image_signatures.html#accessing-image-signatures-using-registry-api


My question is about the signature.json payload. How is this file generated? Do 
we still need to sign the images first using `atomic cli` or skopeo? Is there a 
more generic way of signing the image streams?  

{

"version": 2,

"type": "atomic",

"name": 
"sha256:4028782c08eae4a8c9a28bf661c0a8d1c2fc8e19dbaae2b018b21011197e1484@cddeb7006d914716e2728000746a0b23",

"content": "<cryptographic_signature>"

}


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