The s3:ListBucket permission is required for read operations on S3
binary caches, not just for writes. Without this permission, users get
"Access Denied" errors when running nix-build.
Rather than having a misc tutorial page in the grab-bag "package management" section, this information should just be part of the S3 store docs.
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Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems>