Actions context article revamp (#23628)

data/reusables/github-actions/github_token-input-example.md

@@ -0,0 +1,19 @@
+This example workflow uses the [labeler action](https://github.com/actions/labeler), which requires the `GITHUB_TOKEN` as the value for the `repo-token` input parameter:
+
+```yaml{:copy}
+name: Pull request labeler
+on: [ pull_request_target ]
+
+{% ifversion fpt or ghes > 3.1 or ghae or ghec %}permissions:
+  contents: read
+  pull-requests: write
+
+{% endif %}
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v2
+        with:
+          repo-token: {% raw %}${{ secrets.GITHUB_TOKEN }}{% endraw %}
+```