ci: add linter

hello/hello_test.go

@@ -1,16 +1,16 @@
 package hello
 
 import (
-	"testing"
 	"net/http/httptest"
+	"testing"
 )
 
 func TestHelloHandler(t *testing.T) {
 	w := httptest.NewRecorder()
 	req := httptest.NewRequest("GET", "/hello", nil)
-	HelloHandler(w, req)
+	Handler(w, req)
 	expected := "Hello, World!"
 	if w.Body.String() != expected {
 		t.Errorf("Expected %q but got %q", expected, w.Body.String())
 	}
-}
+}