fix(release): create download directories, refuse duplicate asset names and empty notes (follow gh)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/download.go

@@ -87,6 +87,9 @@ func (a *application) download(cmd *cobra.Command, f downloadFlags, path string,
 	if path == "-" {
 		return writeTerminalSafe(cmd.OutOrStdout(), a.deps.Streams.OutTTY, body)
 	}
+	if err := os.MkdirAll(filepath.Dir(path), 0o777); err != nil {
+		return err
+	}
 	return publish(cmd, path, false, f.clobber, func(destination io.Writer) error {
 		_, err := io.Copy(destination, body)
 		return err