Add instructions on how to user a different user (#140)

* Add instructions on how to user a different user

* Fix wording

* Use special GitHub-provided mail for push examples

* Apply suggestions from code review

Co-authored-by: Federico Grandi <[email protected]>

Author: rugk

README.md

@@ -104,6 +104,21 @@ For more info on how to use outputs, see ["Context and expression syntax"](https
 
 ### Examples:
 
+If you don't want to use your GitHub username for the CI commits, you can [also use the user provided by GitHub for this task](https://github.com/actions/checkout/#push-a-commit-using-the-built-in-token):
+```yaml
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: EndBug/[email protected]
+        with:
+          author_name: github-actions
+          author_email: 41898282+github-actions[bot]@users.noreply.github.com
+```
+
+`41898282+github-actions[bot]@users.noreply.github.com` is the mail of the original GitHub Actions bot. If you use that, [the GitHub avatar is shown for the commits](https://github.community/t/github-actions-bot-email-address/17204). 
+
 Do you want to lint your JavaScript files, located in the `src` folder, with ESLint, so that fixable changes are done without your intervention? You can use a workflow like this:
 
 ```yaml