fix: Add error reporting to PRs with invalid workflows (#7930)

Hello all, I am finally taking the time to follow-up on #6277 to get this implemented :)

## Checklist

### Tests

- I added test coverage for Go changes...
  - [ ] in their respective `*_test.go` for unit tests.
  - [x] in the `tests/integration` directory if it involves interactions with a live Forgejo server.

### Documentation

- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.

### Release notes

- [ ] I do not want this change to show in the release notes.
- [x] I want the title to show in the release notes with a link to this pull request.
- [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.

<!--start release-notes-assistant-->

## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Bug fixes
  - [PR](https://codeberg.org/forgejo/forgejo/pulls/7930): <!--number 7930 --><!--line 0 --><!--description QWRkIGVycm9yIHJlcG9ydGluZyB0byBQUnMgd2l0aCBpbnZhbGlkIHdvcmtmbG93cw==-->Add error reporting to PRs with invalid workflows<!--description-->
<!--end release-notes-assistant-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7930
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Antonin Delpeuch <antonin@delpeuch.eu>
Co-committed-by: Antonin Delpeuch <antonin@delpeuch.eu>

models/actions/run.go

@@ -222,29 +222,38 @@ func InsertRun(ctx context.Context, run *ActionRun, jobs []*jobparser.SingleWork
 	var hasWaiting bool
 	for _, v := range jobs {
 		id, job := v.Job()
-		needs := job.Needs()
-		if err := v.SetJob(id, job.EraseNeeds()); err != nil {
-			return err
+		status := StatusFailure
+		payload := []byte{}
+		needs := []string{}
+		name := run.Title
+		runsOn := []string{}
+		if job != nil {
+			needs = job.Needs()
+			if err := v.SetJob(id, job.EraseNeeds()); err != nil {
+				return err
+			}
+			payload, _ = v.Marshal()
+
+			if len(needs) > 0 || run.NeedApproval {
+				status = StatusBlocked
+			} else {
+				status = StatusWaiting
+				hasWaiting = true
+			}
+			name, _ = util.SplitStringAtByteN(job.Name, 255)
+			runsOn = job.RunsOn()
 		}
-		payload, _ := v.Marshal()
-		status := StatusWaiting
-		if len(needs) > 0 || run.NeedApproval {
-			status = StatusBlocked
-		} else {
-			hasWaiting = true
-		}
-		job.Name, _ = util.SplitStringAtByteN(job.Name, 255)
 		runJobs = append(runJobs, &ActionRunJob{
 			RunID:             run.ID,
 			RepoID:            run.RepoID,
 			OwnerID:           run.OwnerID,
 			CommitSHA:         run.CommitSHA,
 			IsForkPullRequest: run.IsForkPullRequest,
-			Name:              job.Name,
+			Name:              name,
 			WorkflowPayload:   payload,
 			JobID:             id,
 			Needs:             needs,
-			RunsOn:            job.RunsOn(),
+			RunsOn:            runsOn,
 			Status:            status,
 		})
 	}