deb: fix runtime usage for chroot

src/main.rs

@@ -157,9 +157,10 @@ fn main() {
                 _ => None,
             };
 
-            if let Err(e) =
+            if let Err(e) = rt.block_on(async {
                 pkh::deb::build_binary_package(arch, series, Some(cwd.as_path()), *cross, mode)
-            {
+                    .await
+            }) {
                 error!("{}", e);
                 std::process::exit(1);
             }