Send email on Workflow Run Success/Failure (#34982)

Closes #23725 

![1](https://github.com/user-attachments/assets/9bfa76ea-8c45-4155-a5d4-dc2f0667faa8)

![2](https://github.com/user-attachments/assets/49be7402-e5d5-486e-a1c2-8d3222540b13)

/claim #23725

---------

Signed-off-by: NorthRealm <155140859+NorthRealm@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>

services/mailer/notify.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"fmt"
 
+	actions_model "code.gitea.io/gitea/models/actions"
 	activities_model "code.gitea.io/gitea/models/activities"
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
@@ -205,3 +206,10 @@ func (m *mailNotifier) RepoPendingTransfer(ctx context.Context, doer, newOwner *
 		log.Error("SendRepoTransferNotifyMail: %v", err)
 	}
 }
+
+func (m *mailNotifier) WorkflowRunStatusUpdate(ctx context.Context, repo *repo_model.Repository, sender *user_model.User, run *actions_model.ActionRun) {
+	if !run.Status.IsDone() {
+		return
+	}
+	MailActionsTrigger(ctx, sender, repo, run)
+}