feat(timer): implement timer using sleep

Author: uhobeike

.github/workflows/test.yml

@@ -19,7 +19,6 @@ env:
 jobs: 
   test: 
     runs-on: ubuntu-22.04
-    timeout-minutes: 4
     container: osrf/ros:humble-desktop-full
     steps:
       - uses: actions/checkout@v2

test/test.bash

@@ -1,5 +1,7 @@
 #!/bin/bash -evx
 
+(sleep 240 && exit 1) &
+
 ros2 daemon stop
 ros2 daemon start