Case insensitive match for org file extension.

src/command/build/runner.rs

@@ -76,7 +76,7 @@ async fn filter_to_highest_folders_containing_org_files(
             continue;
         }
         match entry.path().extension().and_then(OsStr::to_str) {
-            Some("org") => {
+            Some(ext) if ext.eq_ignore_ascii_case("org") => {
                 return Ok(WalkAction::HaltAndCapture);
             }
             _ => {}

src/command/build/walk_fs.rs

@@ -46,6 +46,7 @@ pub(crate) enum WalkAction {
     Halt,
 
     /// Walk down this path and add it to the return list.
+    #[allow(dead_code)]
     RecurseAndCapture,
 
     /// Walk down this path but do not add it to the return list.