feat: Add Actions API rerun endpoints for runs and jobs (#36768)

This PR adds official REST API endpoints to rerun Gitea Actions workflow
runs and individual jobs:

* POST /api/v1/repos/{owner}/{repo}/actions/runs/{run}/rerun
* POST /api/v1/repos/{owner}/{repo}/actions/runs/{run}/jobs/{job_id}/rerun

It reuses the existing rerun behavior from the web UI and exposes it
through stable API routes.

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

routers/api/v1/api.go

@@ -1259,7 +1259,9 @@ func Routes() *web.Router {
 						m.Group("/{run}", func() {
 							m.Get("", repo.GetWorkflowRun)
 							m.Delete("", reqToken(), reqRepoWriter(unit.TypeActions), repo.DeleteActionRun)
+							m.Post("/rerun", reqToken(), reqRepoWriter(unit.TypeActions), repo.RerunWorkflowRun)
 							m.Get("/jobs", repo.ListWorkflowRunJobs)
+							m.Post("/jobs/{job_id}/rerun", reqToken(), reqRepoWriter(unit.TypeActions), repo.RerunWorkflowJob)
 							m.Get("/artifacts", repo.GetArtifactsOfRun)
 						})
 					})