Detect whether action view branch was deleted (#32764)

Fix #32761 

![图片](https://github.com/user-attachments/assets/a5a7eef8-0fea-4242-b199-1b0b73d9bbdb)

routers/web/repo/actions/actions.go

@@ -245,6 +245,10 @@ func List(ctx *context.Context) {
 		return
 	}
 
+	if err := loadIsRefDeleted(ctx, runs); err != nil {
+		log.Error("LoadIsRefDeleted", err)
+	}
+
 	ctx.Data["Runs"] = runs
 
 	actors, err := actions_model.GetActors(ctx, ctx.Repo.Repository.ID)
@@ -267,6 +271,34 @@ func List(ctx *context.Context) {
 	ctx.HTML(http.StatusOK, tplListActions)
 }
 
+// loadIsRefDeleted loads the IsRefDeleted field for each run in the list.
+// TODO: move this function to models/actions/run_list.go but now it will result in a circular import.
+func loadIsRefDeleted(ctx *context.Context, runs actions_model.RunList) error {
+	branches := make(container.Set[string], len(runs))
+	for _, run := range runs {
+		refName := git.RefName(run.Ref)
+		if refName.IsBranch() {
+			branches.Add(refName.ShortName())
+		}
+	}
+	if len(branches) == 0 {
+		return nil
+	}
+
+	branchInfos, err := git_model.GetBranches(ctx, ctx.Repo.Repository.ID, branches.Values(), false)
+	if err != nil {
+		return err
+	}
+	branchSet := git_model.BranchesToNamesSet(branchInfos)
+	for _, run := range runs {
+		refName := git.RefName(run.Ref)
+		if refName.IsBranch() && !branchSet.Contains(run.Ref) {
+			run.IsRefDeleted = true
+		}
+	}
+	return nil
+}
+
 type WorkflowDispatchInput struct {
 	Name        string   `yaml:"name"`
 	Description string   `yaml:"description"`