enhance(webhook): mention release assets in notifications (#39631)

Release webhook notifications never mention attached files, although the
payload carries them.

The summary shared by all webhook providers now appends an asset count
like `(assets: 2)` for created and updated releases.

Closes https://github.com/go-gitea/gitea/issues/39630
Co-authored-by: silverwind <me@silverwind.io>

services/webhook/general.go

@@ -255,6 +255,10 @@ func getReleasePayloadInfo(p *api.ReleasePayload, linkFormatter linkFormatter, w
 		text += " by " + linkFormatter(setting.AppURL+url.PathEscape(p.Sender.UserName), p.Sender.UserName)
 	}
 
+	if p.Action != api.HookReleaseDeleted && len(p.Release.Attachments) > 0 {
+		text += fmt.Sprintf(" (assets: %d)", len(p.Release.Attachments))
+	}
+
 	return text, color
 }
 

services/webhook/general_test.go

@@ -624,6 +624,7 @@ func TestGetWikiPayloadInfo(t *testing.T) {
 
 func TestGetReleasePayloadInfo(t *testing.T) {
 	p := pullReleaseTestPayload()
+	p.Release.Attachments = []*api.Attachment{{}, {}}
 
 	cases := []struct {
 		action api.HookReleaseAction
@@ -632,12 +633,12 @@ func TestGetReleasePayloadInfo(t *testing.T) {
 	}{
 		{
 			api.HookReleasePublished,
-			"[test/repo] Release created: v1.0 by user1",
+			"[test/repo] Release created: v1.0 by user1 (assets: 2)",
 			greenColor,
 		},
 		{
 			api.HookReleaseUpdated,
-			"[test/repo] Release updated: v1.0 by user1",
+			"[test/repo] Release updated: v1.0 by user1 (assets: 2)",
 			yellowColor,
 		},
 		{