build: fix signature handling

src/build.rs

@@ -28,11 +28,11 @@ pub fn build_source_package(cwd: Option<&Path>) -> Result<(), Box<dyn Error>> {
 
     // If a signing key is found, use it for signing
     if let Some(key_id) = &signing_key {
-        args.push("-sa"); // Sign the source package
         args.push("-k");
         args.push(key_id);
         log::info!("Using GPG key {} for signing", key_id);
     } else {
+        args.push("--no-sign");
         log::info!(
             "No GPG key found for {} ({}), building without signing",
             maintainer_name,