Do not assume working_directory is github.workspace

[ajfabbri]

Setting working_directory for ansible-lint action would fail due to hard-coded .git, introduced in commit 6f728e0, when fetching .config/requirements-lock.txt.

This fix replaces .git with ${{ github.workspace }}/.git to make working_directory argument work again.

Tested that this does fix my github action, i.e.:

name: ansible-lint
on:
  pull_request:
    branches: ["main", "release/v*"]
jobs:
  build:
    name: Ansible Lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Run ansible-lint
        uses: ajfabbri/ansible-lint@main
        # this is broken :-( https://github.com/ansible/ansible-lint/issues/3938
        with:
          working_directory: iac

Fixes #3938

[commarla]

Thanks for this PR. I was waiting for this but then I encountered this bug actions/runner#2058
This solution does not working if running the action inside a container