Bump the minor-actions-dependencies group across 1 directory with 2 updates

Bumps the minor-actions-dependencies group with 2 updates in the / directory: [actions/publish-immutable-action](https://github.com/actions/publish-immutable-action) and [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `actions/publish-immutable-action` from 0.0.3 to 0.0.4
- [Release notes](https://github.com/actions/publish-immutable-action/releases)
- [Commits](https://github.com/actions/publish-immutable-action/compare/0.0.3...v0.0.4)

Updates `docker/build-push-action` from 6.5.0 to 6.9.0
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v6.5.0...v6.9.0)

---
updated-dependencies:
- dependency-name: actions/publish-immutable-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: minor-actions-dependencies
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor-actions-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/publish-immutable-actions.yml

@@ -17,4 +17,4 @@ jobs:
         uses: actions/checkout@v4
       - name: Publish
         id: publish
-        uses: actions/publish-immutable-action@0.0.3
+        uses: actions/publish-immutable-action@v0.0.4

.github/workflows/update-test-ubuntu-git.yml

@@ -48,7 +48,7 @@ jobs:
 
       # Use `docker/build-push-action` to build (and optionally publish) the image. 
       - name: Build Docker Image (with optional Push)
-        uses: docker/build-push-action@v6.5.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: .
           file: images/test-ubuntu-git.Dockerfile

README.md

@@ -143,6 +143,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 - [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
 - [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
 - [Push a commit using the built-in token](#Push-a-commit-using-the-built-in-token)
+- [Push a commit to a PR using the built-in token](#Push-a-commit-to-a-PR-using-the-built-in-token)
 
 ## Fetch only the root files
 
@@ -288,6 +289,31 @@ jobs:
 ```
 *NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
 
+## Push a commit to a PR using the built-in token
+
+In a pull request trigger, `ref` is required as GitHub Actions checks out in detached HEAD mode, meaning it doesn’t check out your branch by default.
+
+```yaml
+on: pull_request
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+      - run: |
+          date > generated.txt
+          # Note: the following account information will not work on GHES
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add .
+          git commit -m "generated"
+          git push
+```
+*NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
+
+
 # License
 
 The scripts and documentation in this project are released under the [MIT License](LICENSE)