fix: legacy folder asset (#3264)

packages/cli/src/assets/file.rs

@@ -38,10 +38,10 @@ pub(crate) fn process_file_to(
             Some("jpg" | "jpeg" | "png" | "webp" | "avif") => {
                 process_image(&ImageAssetOptions::new(), source, output_path)?;
             }
-            None if source.is_dir() => {
-                process_folder(source, output_path)?;
-            }
             Some(_) | None => {
+                if source.is_dir() {
+                    process_folder(source, output_path)?;
+                } else {
                     let source_file = std::fs::File::open(source)?;
                     let mut reader = std::io::BufReader::new(source_file);
                     let output_file = std::fs::File::create(output_path)?;
@@ -53,6 +53,7 @@ pub(crate) fn process_file_to(
                         )
                     })?;
                 }
+            }
         },
         AssetOptions::Css(options) => {
             process_css(options, source, output_path)?;