Use correct user on releases (#17806)

- Use the provided `doer` instead of `rel.Publisher`. The code will also
run on edited releases and deleted ones, which isn't necessary done by
`rel.Publisher`.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/notification/webhook/webhook.go

@@ -769,12 +769,12 @@ func sendReleaseHook(doer *user_model.User, rel *models.Release, action api.Hook
 		return
 	}
 
-	mode, _ := models.AccessLevel(rel.Publisher, rel.Repo)
+	mode, _ := models.AccessLevel(doer, rel.Repo)
 	if err := webhook_services.PrepareWebhooks(rel.Repo, webhook.HookEventRelease, &api.ReleasePayload{
 		Action:     action,
 		Release:    convert.ToRelease(rel),
 		Repository: convert.ToRepo(rel.Repo, mode),
-		Sender:     convert.ToUser(rel.Publisher, nil),
+		Sender:     convert.ToUser(doer, nil),
 	}); err != nil {
 		log.Error("PrepareWebhooks: %v", err)
 	}