"Host Your Own Nix Binary Cache Server" is outdated

[Svenum]

URL: https://nixos-and-flakes.thiscute.world/nix-store/host-your-own-binary-cache-server

Some commands on this page are outdated:

# old:
mc admin policy add s3 nix-cache-write nix-cache-write.json
# new:
mc admin policy create s3 nix-cache-write nix-cache-write.json

# old:
mc admin policy set s3 nix-cache-write user=nixbuilder
# new:
mc admin policy attach s3 nix-cache-write -user nixbuilder

and the step Pushing Store Paths to Binary Cache does not work for me.

The signing works great, but If I want to upload my "/run/current-system"

I got this error:

error: AWS error uploading 'nix-cache-info': Unable to parse ExceptionName: MalformedXML Message: The XML you provided was not well-formed or did not validate against our published schema

[Svenum]

Maybe add an article for https://github.com/zhaofengli/attic. Its much simpler to use.