nix copy to s3: [AuthCredentialsProvider] - Failed to resolve role arn during sts web identity provider initialization.

[guskovd]

Describe the bug

I get an error when trying to copy to an s3-compatible minio server.

[ERROR] [2025-12-28T15:40:38Z] [0000ffffba162020] [AuthCredentialsProvider] - Failed to resolve role arn during sts web identity provider initialization.

In fact, the copying is successful, but I'm not quite clear about the region checks when using the 'endpoint' parameter.
As far as I can tell, 'endpoint' is only used for the minio implementation.

I haven't seen such errors on versions of nix < 2.33.0

Steps To Reproduce

nix copy --refresh --to 's3://nix-cache?endpoint=my-minio' --all --verbose

[xokdvium]

Yeah the logs are just overly verbose. We should implement our own logger for AWS library, since it spams us with non-fatal errors. #14771, that needs more work