composefs-boot: support writing insecure composefs cmdline

Supports writing `composefs=?<root-id>`.

Signed-off-by: Sanne Raymaekers <[email protected]>

Author: croissanne

src/main.rs

@@ -291,6 +291,7 @@ async fn main() -> Result<()> {
                     &repo,
                     entry,
                     &id,
+                    args.insecure,
                     bootdir,
                     None,
                     entry_id.as_deref(),