fix file created_at not working on some targets

backend/src/lib/outbound/file_system.rs

@@ -1,6 +1,5 @@
-use std::time::UNIX_EPOCH;
-
 use anyhow::{Context, anyhow, bail};
+use rustix::fs::statx;
 use tokio::{
     fs,
     io::{self, AsyncWriteExt as _},
@@ -72,12 +71,19 @@ impl FileSystem {
                     continue;
                 }
             };
-            let metadata = entry.metadata().await?;
-            let created_at = metadata
-                .created()
-                .ok()
-                .map(|c| c.duration_since(UNIX_EPOCH).ok().map(|c| c.as_secs()))
-                .flatten();
+
+            // TODO: Use `DirEntry::metadata` once `target=x86_64-unknown-linux-musl` updates from musl 1.2.3 to 1.2.5
+            // https://github.com/rust-lang/rust/pull/142682
+            let created_at = unsafe {
+                statx(
+                    std::os::fd::BorrowedFd::borrow_raw(-100),
+                    entry.path(),
+                    rustix::fs::AtFlags::empty(),
+                    rustix::fs::StatxFlags::BTIME,
+                )
+            }
+            .ok()
+            .map(|statx| statx.stx_btime.tv_sec as u64);
 
             let mime_type = match file_type {
                 FileType::File => FileMimeType::from_name(&name),