Update `workflow_run` event with new `in_progress` action (#31251)

Co-authored-by: Lucas Costi <lucascosti@users.noreply.github.com>

content/actions/using-workflows/events-that-trigger-workflows.md

@@ -1363,7 +1363,7 @@ jobs:
 
 | Webhook event payload | Activity types | `GITHUB_SHA` | `GITHUB_REF` |
 | --------------------- | -------------- | ------------ | -------------|
-| [`workflow_run`](/developers/webhooks-and-events/webhooks/webhook-events-and-payloads/#workflow_run) | - `completed`<br/>- `requested` | Last commit on default branch | Default branch |
+| [`workflow_run`](/developers/webhooks-and-events/webhooks/webhook-events-and-payloads/#workflow_run) | - `completed`<br/>- `requested`{% ifversion actions-workflow-run-in-progress %}<br/>- `in_progress`{% endif %} | Last commit on default branch | Default branch |
 
 {% note %}
 

data/features/actions-workflow-run-in-progress.yml

@@ -0,0 +1,7 @@
+# Reference: PR#31251
+# New action for the `workflow_run` webhook event that is triggered when a workflow run is `in_progress`.
+versions:
+  fpt: '*'
+  ghec: '*'
+  ghes: '>=3.8'
+  ghae: '>=3.8'

data/reusables/webhooks/workflow_run_properties.md

@@ -1,4 +1,4 @@
 Key | Type | Description
 ----|------|-------------
-`action`|`string` | The action that was performed. Can be one of `requested` or `completed`.
+`action`|`string` | The action that was performed. Can be one of `requested`{% ifversion actions-workflow-run-in-progress %}, `in_progress`,{% endif %} or `completed`.
 `workflow_run`| `object` | The workflow run. Includes information such as `artifacts_url`, `check_suite_id`, `conclusion`, `head_branch`, and `head_sha`.