Describe the bug

Latest gh on GHA at the moment.
https://github.com/cli/cli/releases/tag/v2.63.2 was released 7 days ago.

Steps to reproduce the behavior

1. We're trying to add a team reviewer:

on:
  pull_request:
    types:
      - edited
jobs:
  job:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - run: gh pr edit "${PR_NUMBER}" --add-reviewer "${REVIEWER_TEAM}"
        env:
          GH_TOKEN: ${{ github.token }}
          GH_REPO: ${{ github.repository }}
          REVIEWER_TEAM: my-org/my-team
          PR_NUMBER: ${{ github.event.pull_request.number }}

2. The output is:

could not determine current branch: failed to run git: fatal: not a git repository (or any of the parent directories): .git

even though we clearly defined the repository with GH_REPO, so gh should go into auto-detect mode.

3. Add a checkout step

- uses: actions/checkout@v4

4. The output is:

could not determine current branch: failed to run git: not on any branch

5. Configure the checkout step

- uses: actions/checkout@v4
  with:
    ref: ${{ github.event.pull_request.head.ref }}

6. Finally got a proper error message that we need permissions for organisation.teams -> https://github.com/orgs/community/discussions/113519

Expected vs actual behavior

Expected behavior would be that we're not forced to clone the repo just to get the branch name, which is seemingly not even used in the command.