fix(actions): show run index in run view and fix summary graph height (#38165)

- Display the per-repository run number as `#N` next to the run title in
the run view, matching the runs list and GitHub
- Add the run `Index` to the run view API response (and the devtest
mock) to support that
- Restore the summary panel's `flex: 1` so the workflow graph fills the
right-column height even when a run has no job summaries
- Keep the job-summary section content-sized so it doesn't compete with
the graph for height
- Gate the devtest mock job summaries to a subset of runs so the devtest
page also exercises the no-summary layout

<img width="521" height="232" alt="image"
src="https://github.com/user-attachments/assets/a1f2f20b-65bd-4d98-ba6a-b8135580a6de"
/>

routers/web/devtest/mock_actions.go

@@ -85,6 +85,7 @@ func MockActionsRunsJobs(ctx *context.Context) {
 	}
 	resp := &actions.ViewResponse{}
 	resp.State.Run.RepoID = 12345
+	resp.State.Run.Index = runID
 	resp.State.Run.TitleHTML = `mock run title <a href="/">link</a>`
 	resp.State.Run.Link = setting.AppSubURL + "/devtest/repo-action-view/runs/" + strconv.FormatInt(runID, 10)
 	resp.State.Run.CanDeleteArtifact = true
@@ -199,17 +200,20 @@ func MockActionsRunsJobs(ctx *context.Context) {
 	resp.State.Run.CanRerunFailed = runID == 30 && isLatestAttempt
 
 	// Mock job summaries so the devtest page can preview the Summary panel rendering.
-	resp.State.Run.JobSummaries = []*actions.ViewJobSummary{
-		{
-			JobID:       runID * 10,
-			JobName:     "job 100 (testsubname)",
-			SummaryHTML: renderUtils.MarkdownToHtml("### Devtest job summary\n\n- Markdown rendering\n- Links: [example](https://example.com)\n\n```sh\necho hello\n```\n"),
-		},
-		{
-			JobID:       runID*10 + 2,
-			JobName:     "ULTRA LOOOOOOOOOOOONG job name 102 that exceeds the limit",
-			SummaryHTML: renderUtils.MarkdownToHtml("### Another summary\n\nThis demonstrates multiple job summaries in one run.\n\n- Item A\n- Item B\n"),
-		},
+	// Only some runs have summaries, so the page also exercises the "no summary" state.
+	if runID == 10 || runID == 20 {
+		resp.State.Run.JobSummaries = []*actions.ViewJobSummary{
+			{
+				JobID:       runID * 10,
+				JobName:     "job 100 (testsubname)",
+				SummaryHTML: renderUtils.MarkdownToHtml("### Devtest job summary\n\n- Markdown rendering\n- Links: [example](https://example.com)\n\n```sh\necho hello\n```\n"),
+			},
+			{
+				JobID:       runID*10 + 2,
+				JobName:     "ULTRA LOOOOOOOOOOOONG job name 102 that exceeds the limit",
+				SummaryHTML: renderUtils.MarkdownToHtml("### Another summary\n\nThis demonstrates multiple job summaries in one run.\n\n- Item A\n- Item B\n"),
+			},
+		}
 	}
 
 	resp.Artifacts = append(resp.Artifacts, &actions.ArtifactsViewItem{

routers/web/repo/actions/view.go

@@ -294,6 +294,7 @@ type ViewResponse struct {
 			// or "/owner/repo/actions/runs/123/attempts/2" for a historical attempt.
 			// Use this when the target should reflect the currently-viewed attempt.
 			ViewLink          string            `json:"viewLink"`
+			Index             int64             `json:"index"` // the per-repository run number, displayed as "#N"
 			Title             string            `json:"title"`
 			TitleHTML         template.HTML     `json:"titleHTML"`
 			Status            string            `json:"status"`
@@ -561,6 +562,7 @@ func fillViewRunResponseSummary(ctx *context_module.Context, resp *ViewResponse,
 	isLatestAttempt := run.LatestAttemptID == 0 || (attempt != nil && attempt.ID == run.LatestAttemptID)
 
 	resp.State.Run.RepoID = ctx.Repo.Repository.ID
+	resp.State.Run.Index = run.Index
 	// the title for the "run" is from the commit message
 	resp.State.Run.Title = run.Title
 	resp.State.Run.TitleHTML = templates.NewRenderUtils(ctx).RenderCommitMessage(run.Title, ctx.Repo.Repository)