Update cmd/main.go with the examplebroker changes

Now the daemon executes its own system bus and exports the broker on it.

cmd/authd/main.go

@@ -7,10 +7,12 @@ import (
 	"os/signal"
 	"sync"
 	"syscall"
+	"time"
 
 	"github.com/ubuntu/authd/cmd/authd/daemon"
 	"github.com/ubuntu/authd/internal/brokers/examplebroker"
 	"github.com/ubuntu/authd/internal/log"
+	"github.com/ubuntu/authd/internal/testutils"
 )
 
 //FIXME go:generate go run ../generate_completion_documentation.go completion ../../generated
@@ -19,15 +21,32 @@ import (
 
 func main() {
 	//i18n.InitI18nDomain(common.TEXTDOMAIN)
+	cleanup, err := testutils.StartSystemBusMock()
+	if err != nil {
+		os.Exit(1)
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	done := make(chan struct{})
 	go func() {
-		err := examplebroker.StartBus()
-		if err != nil {
+		if err = examplebroker.StartBus(ctx); err != nil {
 			log.Error(context.Background(), err)
+			cleanup()
 			os.Exit(1)
 		}
+		close(done)
 	}()
-	a := daemon.New()
-	os.Exit(run(a))
+	// Give some time for the broker to start
+	time.Sleep(time.Second)
+
+	exitCode := run(daemon.New())
+	// After the daemon has exited, we can stop the broker as well.
+	cancel()
+	<-done
+	// We use os.Exit, so we need to call cleanup manually since defered functions won't be executed.
+	cleanup()
+	os.Exit(exitCode)
 }
 
 type app interface {