chore: use json logger

cmd/schreifuchs-ch/main.go

@@ -23,13 +23,19 @@ func main() {
 		cancle()
 	}()
 
-	slog.SetLogLoggerLevel(slog.LevelDebug)
+	slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelDebug})))
 
 	cfg, err := config.Read(ctx)
 	if err != nil {
 		slog.Error("could not read configuaration", "err", err)
 	}
 
+	slog.SetDefault(
+		slog.New(
+			slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: cfg.LogLevel}),
+		),
+	)
+
 	err = server.Start(ctx, cfg)
 	if err != nil {
 		slog.Error("error while serving", "err", err)