fix: superfluous increment of ActionTask attempt breaks job view (#11956)

https://codeberg.org/forgejo/forgejo/pulls/11750 missed a place where the attempt number is incremented independently. This caused the job view to break when running a reusable workflow with workflow expansion.

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### Tests for Go changes

(can be removed for JavaScript changes)

- 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.
- I ran...
  - [x] `make pr-go` before pushing

### Tests for JavaScript changes

(can be removed for Go changes)

- I added test coverage for JavaScript changes...
  - [ ] in `web_src/js/*.test.js` if it can be unit tested.
  - [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).

### 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

- [ ] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [x] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.

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Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11956
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Andreas Ahlenstorf <andreas@ahlenstorf.ch>
Co-committed-by: Andreas Ahlenstorf <andreas@ahlenstorf.ch>

models/actions/task.go

@@ -451,9 +451,7 @@ func CreateTaskForRunner(ctx context.Context, runner *ActionRunner, requestKey,
 }
 
 // Placeholder tasks are created when the status/content of an [ActionRunJob] is resolved by Forgejo without dispatch to
-// a runner, specifically in the case of a workflow call's outer job. It is the responsibility of the caller to
+// a runner, specifically in the case of a workflow call's outer job.
-// increment the job's Attempt field before invoking this method, and to update that field in the database, so that
-// reruns can function for placeholder tasks and provide updated outputs.
 func CreatePlaceholderTask(ctx context.Context, job *ActionRunJob, outputs map[string]string) (*ActionTask, error) {
 	actionTask := &ActionTask{
 		JobID:             job.ID,

services/actions/Test_tryHandleWorkflowCallOuterJob/action_run_job.yml

@@ -1,6 +1,7 @@
 # Case 600 -- workflow that is not a workflow call outer job
 -
   id: 600
+  attempt: 1
   status: 1 # success
   started: 1683636528
   workflow_payload: |
@@ -18,6 +19,7 @@
 # contexts should be considered as those in `on.workflow_call.outputs`.
 -
   id: 601
+  attempt: 1
   run_id: 900
   status: 1 # success
   started: 1683636528
@@ -44,6 +46,7 @@
       workflow_call_id: b5a9f46f1f2513d7777fde50b169d323a6519e349cc175484c947ac315a209ed
 - # inner job of run 601
   id: 602
+  attempt: 1
   run_id: 900
   status: 1 # success
   job_id: outer-job.inner-job
@@ -54,7 +57,7 @@
 -
   id: 603
   run_id: 901
-  attempt: 1
+  attempt: 2
   status: 1 # success
   started: 1683636528
   needs: ["outer-job.inner-job"]
@@ -81,6 +84,7 @@
 - # inner job of run 603
   id: 604
   run_id: 901
+  attempt: 2
   status: 1 # success
   job_id: outer-job.inner-job
   task_id: 101

services/actions/job_emitter.go

@@ -597,7 +597,6 @@ func tryHandleWorkflowCallOuterJob(ctx context.Context, job *actions_model.Actio
 	)
 
 	// Insert a placeholder task with all the computed outputs
-	job.Attempt++
 	actionTask, err := actions_model.CreatePlaceholderTask(ctx, job, outputs)
 	if err != nil {
 		return nil, fmt.Errorf("failure to insert placeholder task: %w", err)