Reintroduce branch_protection_rule actions trigger docs

(also nixes some trailing spaces)

content/actions/learn-github-actions/events-that-trigger-workflows.md

@@ -62,7 +62,7 @@ Cron syntax has five fields separated by a space, and each field represents a un
 │ │ ┌───────────── day of the month (1 - 31)
 │ │ │ ┌───────────── month (1 - 12 or JAN-DEC)
 │ │ │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
-│ │ │ │ │                                   
+│ │ │ │ │
 │ │ │ │ │
 │ │ │ │ │
 * * * * *
@@ -89,7 +89,7 @@ Notifications for scheduled workflows are sent to the user who last modified the
 
 ## Manual events
 
-You can manually trigger workflow runs. To trigger specific workflows in a repository, use the `workflow_dispatch` event. To trigger more than one workflow in a repository and create custom events and event types, use the `repository_dispatch` event. 
+You can manually trigger workflow runs. To trigger specific workflows in a repository, use the `workflow_dispatch` event. To trigger more than one workflow in a repository and create custom events and event types, use the `repository_dispatch` event.
 
 ### `workflow_dispatch`
 
@@ -190,6 +190,28 @@ You can configure your workflow to run when webhook events are generated on {% d
 
 Not all webhook events trigger workflows. For the complete list of available webhook events and their payloads, see "[Webhook events and payloads](/developers/webhooks-and-events/webhook-events-and-payloads)."
 
+{% ifversion fpt or ghes > 3.2 or ghae-next %}
+### `branch_protection_rule`
+
+Runs your workflow anytime the `branch_protection_rule` event occurs. {% data reusables.developer-site.multiple_activity_types %} For information about the GraphQL API, see "[BranchProtectionRule](/graphql/reference/objects#branchprotectionrule)."
+
+{% data reusables.github-actions.branch-requirement %}
+
+| Webhook event payload | Activity types | `GITHUB_SHA` | `GITHUB_REF` |
+| --------------------- | -------------- | ------------ | -------------|
+| [`branch_protection_rule`](/webhooks/event-payloads/#branch_protection_rule) | - `created`<br/>- `edited`<br/>- `deleted` | Last commit on default branch | Default branch |
+
+{% data reusables.developer-site.limit_workflow_to_activity_types %}
+
+For example, you can run a workflow when a branch protection rule has been `created` or `deleted`.
+
+```yaml
+on:
+  branch_protection_rule:
+    types: [created, deleted]
+```
+{% endif %}
+
 ### `check_run`
 
 Runs your workflow anytime the `check_run` event occurs. {% data reusables.developer-site.multiple_activity_types %} For information about the REST API, see "[Check runs](/rest/reference/checks#runs)."
@@ -589,7 +611,7 @@ Runs your workflow anytime the `pull_request` event occurs. {% data reusables.de
 
 {% note %}
 
-**Notes:** 
+**Notes:**
 - By default, a workflow only runs when a `pull_request`'s activity type is `opened`, `synchronize`, or `reopened`. To trigger workflows for more activity types, use the `types` keyword.
 - Workflows will not run on `pull_request` activity if the pull request has a merge conflict. The merge conflict must be resolved first.
 
@@ -808,7 +830,7 @@ on:
   workflow_run:
     workflows: ["Run Tests"]
     branches: [main]
-    types: 
+    types:
       - completed
       - requested
 ```