fix(signal): remove call to os.Exit to ensure app cleanups are run

This change removes the call to `os.Exit` on a 2nd OS signal, to ensure
that the application's cleanups - most often represented as `defer`
calls - are properly called (since calls to `os.Exit` prevent `defer`
functions execution.)

signal.go

@@ -37,8 +37,6 @@ func SetupSignalHandler() context.Context {
 	go func() {
 		<-c
 		cancel()
-		<-c
-		os.Exit(1) // second signal. Exit directly.
 	}()
 
 	return ctx