Separate error types for k2v and signature

src/api/signature/mod.rs

@@ -4,11 +4,12 @@ use sha2::Sha256;
 
 use garage_util::data::{sha256sum, Hash};
 
-use crate::s3::error::*;
-
+pub mod error;
 pub mod payload;
 pub mod streaming;
 
+use error::*;
+
 pub const SHORT_DATE: &str = "%Y%m%d";
 pub const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";