runtime-rs: move the sandbox start from sandbox init function

Split the sandbox start from the sandbox init process, and call
them separately.

Signed-off-by: Fupan Li <fupan.lfp@antgroup.com>

src/runtime-rs/crates/runtimes/src/manager.rs

@@ -138,14 +138,6 @@ impl RuntimeHandlerManagerInner {
         Ok(())
     }
 
-    #[instrument]
-    async fn start_runtime_handler(&self) -> Result<()> {
-        if let Some(instance) = self.runtime_instance.as_ref() {
-            instance.sandbox.start().await.context("start sandbox")?;
-        }
-        Ok(())
-    }
-
     #[instrument]
     async fn try_init(
         &mut self,
@@ -200,10 +192,6 @@ impl RuntimeHandlerManagerInner {
             .await
             .context("init runtime handler")?;
 
-        self.start_runtime_handler()
-            .await
-            .context("start runtime handler")?;
-
         // the sandbox creation can reach here only once and the sandbox is created
         // so we can safely create the shim management socket right now
         // the unwrap here is safe because the runtime handler is correctly created
@@ -411,6 +399,12 @@ impl RuntimeHandlerManager {
                 .await
                 .context("get runtime instance")?;
 
+            instance
+                .sandbox
+                .start()
+                .await
+                .context("start sandbox in task handler")?;
+
             let container_id = container_config.container_id.clone();
             let shim_pid = instance
                 .container_manager