style: refactor tests and update CI configurations

- Remove `nolint:unparam` comment from `serve_test.go` file

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

serve_test.go

@@ -13,7 +13,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-//nolint:unparam
 func PerformRequest(r http.Handler, method, path string) *httptest.ResponseRecorder {
 	req, _ := http.NewRequestWithContext(context.Background(), method, path, nil)
 	w := httptest.NewRecorder()