Documentation update if using GitHub App

[igitcode]

Not really an issue, but I need to use a GH app to bypass branch protection rules. So my configuration is as follows:

On git checkout, you must not persist credentials, otherwise they cannot be overridden by github_token input var:

      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          persist-credentials: 'false'

I used the actions/create-github-app-token action to generate token from GitHub App ID and PrivateKey.

      - uses: actions/create-github-app-token@v1
        id: app-token

I can use that token on this action as:

    - name: Commit Changes
       id: commit-changes
       uses: actions-js/push@v1.5
       with:
         github_token: ${{ steps.app-token.outputs.token }}

[igitcode]

Apparently this causes the rebase command to fail, because it has no user name 😢