Merge 3c3e99848b36c587c8046383ab04e86713061576 into 3b9b8c884f6b4bb4d5be2779c26374abadae0871

Add a scenario where it is necessary to push a commit to a pull request.

README.md

@@ -79,6 +79,8 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     clean: ''
 
     # Partially clone against a given filter. Overrides sparse-checkout if set.
+    # Note that when a filter is provided, fetch-depth is still respected; you
+    # may want to specify `fetch-depth: 0` to ensure the full history is fetched.
     # Default: null
     filter: ''
 
@@ -143,6 +145,7 @@ 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 +291,31 @@ 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)

action.yml

@@ -59,8 +59,9 @@ inputs:
     default: true
   filter:
     description: >
-      Partially clone against a given filter.
+      Partially clone against a given filter. Overrides sparse-checkout if set.
-      Overrides sparse-checkout if set.
+      Note that when a filter is provided, fetch-depth is still respected; you
+      may want to specify `fetch-depth: 0` to ensure the full history is fetched.
     default: null
   sparse-checkout:
     description: >