limit the azcopy concurrency
@@ -58,6 +58,7 @@ async fn az_impl(mode: Mode, src: &OsStr, dst: &OsStr, args: &[&str]) -> Result<
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.env("AZCOPY_LOG_LOCATION", temp_dir.path())
+ .env("AZCOPY_CONCURRENCY_VALUE", "32")
.arg(mode.to_string())
.arg(&src)
.arg(&dst)
