Detect whether action view branch was deleted (#32764)

Fix #32761 

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

models/actions/run.go

@@ -37,6 +37,7 @@ type ActionRun struct {
 	TriggerUser       *user_model.User       `xorm:"-"`
 	ScheduleID        int64
 	Ref               string `xorm:"index"` // the commit/tag/… that caused the run
+	IsRefDeleted      bool   `xorm:"-"`
 	CommitSHA         string
 	IsForkPullRequest bool                         // If this is triggered by a PR from a forked repository or an untrusted user, we need to check if it is approved and limit permissions when running the workflow.
 	NeedApproval      bool                         // may need approval if it's a fork pull request

models/git/branch.go

@@ -12,6 +12,7 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/optional"
@@ -169,9 +170,22 @@ func GetBranch(ctx context.Context, repoID int64, branchName string) (*Branch, e
 	return &branch, nil
 }
 
-func GetBranches(ctx context.Context, repoID int64, branchNames []string) ([]*Branch, error) {
+func GetBranches(ctx context.Context, repoID int64, branchNames []string, includeDeleted bool) ([]*Branch, error) {
 	branches := make([]*Branch, 0, len(branchNames))
-	return branches, db.GetEngine(ctx).Where("repo_id=?", repoID).In("name", branchNames).Find(&branches)
+
+	sess := db.GetEngine(ctx).Where("repo_id=?", repoID).In("name", branchNames)
+	if !includeDeleted {
+		sess.And("is_deleted=?", false)
+	}
+	return branches, sess.Find(&branches)
+}
+
+func BranchesToNamesSet(branches []*Branch) container.Set[string] {
+	names := make(container.Set[string], len(branches))
+	for _, branch := range branches {
+		names.Add(branch.Name)
+	}
+	return names
 }
 
 func AddBranches(ctx context.Context, branches []*Branch) error {