Testing: Improve application signal handling test coverage (#2052)

.github/workflows/test-only.yml

@@ -118,7 +118,8 @@ jobs:
           sleep 3
           # invert the check (it should be not 0/not running)
           docker ps
-          docker logs sig-test
+          # check signal catch(STDOUT) log
+          docker logs sig-test | grep 'Shutdown: Got Signal - SIGINT' || exit 1
           test -z "`docker ps|grep sig-test`"
           if [ $? -ne 0 ]
           then
@@ -138,7 +139,7 @@ jobs:
           sleep 3
           # invert the check (it should be not 0/not running)
           docker ps
-          docker logs sig-test
+          docker logs sig-test | grep 'Shutdown: Got Signal - SIGTERM' || exit 1
           test -z "`docker ps|grep sig-test`"
           if [ $? -ne 0 ]
           then