fix: url validation in webhook add/edit API (#7932)

Cherry-pick from 972381097c (see #7909).

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7932
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Antonin Delpeuch <antonin@delpeuch.eu>
Co-committed-by: Antonin Delpeuch <antonin@delpeuch.eu>

routers/api/v1/utils/main_test.go

@@ -0,0 +1,21 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package utils
+
+import (
+	"testing"
+
+	"forgejo.org/models/unittest"
+	"forgejo.org/modules/setting"
+	webhook_service "forgejo.org/services/webhook"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m, &unittest.TestOptions{
+		SetUp: func() error {
+			setting.LoadQueueSettings()
+			return webhook_service.Init()
+		},
+	})
+}