Do not send notifications for draft releases (#21451)

Fixes #21448

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>

services/release/release.go

@@ -271,13 +271,12 @@ func UpdateRelease(doer *user_model.User, gitRepo *git.Repository, rel *repo_mod
 		}
 	}
 
-	if !isCreated {
-		notification.NotifyUpdateRelease(doer, rel)
-		return
-	}
-
 	if !rel.IsDraft {
-		notification.NotifyNewRelease(rel)
+		if isCreated {
+			notification.NotifyNewRelease(rel)
+		} else {
+			notification.NotifyUpdateRelease(doer, rel)
+		}
 	}
 
 	return err
@@ -353,7 +352,9 @@ func DeleteReleaseByID(ctx context.Context, id int64, doer *user_model.User, del
 		}
 	}
 
-	notification.NotifyDeleteRelease(doer, rel)
+	if !rel.IsDraft {
+		notification.NotifyDeleteRelease(doer, rel)
+	}
 
 	return nil
 }