Requires running from a top-level git repository

[mike-potter]

When using the docker container run command to execute, it gives this error:

fatal: not a git repository (or any parent up to mount point /github)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/local/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.9/site-packages/actions_includes/__main__.py", line 25, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/actions_includes/__init__.py", line 999, in main
    git_root_output = subprocess.check_output(
  File "/usr/local/lib/python3.9/subprocess.py", line 424, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/local/lib/python3.9/subprocess.py", line 528, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['git', 'rev-parse', '--show-toplevel']' returned non-zero exit status 128.

if you run it from a folder that is not a git repository. Would be nice to remove the git dependency here. As a yml processor it should just be talking the input src files and outputting the resulting workflow files regardless of whether I'm in a git checkout repo or not.