Workaround for QEMU BUG that causes CI to hang

framework/jinux-frame/src/arch/x86/irq.rs

@@ -27,6 +27,10 @@ pub(crate) fn init() {
 
 pub(crate) fn enable_local() {
     x86_64::instructions::interrupts::enable();
+    // When emulated with QEMU, interrupts may not be delivered if a STI instruction is immediately
+    // followed by a RET instruction. It is a BUG of QEMU, see the following patch for details.
+    // https://lore.kernel.org/qemu-devel/20231210190147.129734-2-lrh2000@pku.edu.cn/
+    x86_64::instructions::nop();
 }
 
 pub(crate) fn disable_local() {