I need some clarification on a S3 backed registry.
I use a S3 backed registry authenticated through ec2 instance role.
Is it possible to use a foreign S3 bucket, which is only accessible through "assume role"? If I do the "sts assume-role" manually I can access the bucket manually. But do the instance role somehow incorporate the role to assume automatically? Or is something needed within AWS SDK to do this?
#917 let me guess that it should work but the registry fails with s3aws: NoCredentialProviders: no valid providers in chain. Deprecated.

I used g7a09723 because of #1937 didn't make it into 2.6.0.