Add git safe directory to workaround github actions ownership issues

[djhoese]

Closes #25

As discussed in #25, new versions of git check ownership of .git directories. Until github/github actions change how docker-based actions are called, this will cause failures every time coverage/coveralls checks for metadata about the current commit. This PR is the simplest fix I could think of to accomplish this. The alternative would be to add a subprocess.run call in entrypoint.py to run the same command there. I figure since this repository is just a github action and nothing else that doing it in the Dockerfile would be fine.

When I use this on my own CI I see:

   File "/usr/local/lib/python3.12/site-packages/coveralls/api.py", line 301, in submit_report
    raise CoverallsException(
coveralls.exception.CoverallsException: Could not submit coverage: 422 Client Error: Unprocessable Entity for url: https://coveralls.io/api/v1/jobs

I'm hoping this is just a hiccup or a threshold from coveralls that they are mad about me restarting the same CI job over and over again.

[djhoese]

I'm not sure what I did but coveralls seems to be made at me.

[djhoese]

@AndreMiras Is the failing test expected to fail?

 Running on Github Actions but GITHUB_TOKEN is not set. Add "env: GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}" to your step config.
Traceback (most recent call last):
  File "/src/entrypoint.py", line 176, in try_main
    main()
  File "/src/entrypoint.py", line 171, in main
    run_coveralls(repo_token, parallel, flag_name, base_path)
  File "/src/entrypoint.py", line 80, in run_coveralls
    coveralls = Coveralls(service_name=service_name, **kwargs)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/coveralls/api.py", line 47, in __init__
    self.ensure_token()
  File "/usr/local/lib/python3.12/site-packages/coveralls/api.py", line 54, in ensure_token
    raise CoverallsException(
coveralls.exception.CoverallsException: Running on Github Actions but GITHUB_TOKEN is not set. Add "env: GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}" to your step config.
ExitCode.FAILURE

I (my fork) doesn't have access to the COVERALLS_REPO_TOKEN secret, right?

[AndreMiras]

Thanks for the PR, it looks good to me. Indeed for the repo secret access
Edit: why did you make the change at build time in the Dockerfile and not at run time in the entrypoint.py by the way?

[djhoese]

From the original description:

This PR is the simplest fix I could think of to accomplish this. The alternative would be to add a subprocess.run call in entrypoint.py to run the same command there. I figure since this repository is just a github action and nothing else that doing it in the Dockerfile would be fine.

Doing it in the entrypoint would require a subprocess call that just seemed uglier, but if you have strong feelings about it it doesn't matter much to me. I could do something as simple as a subprocess.check_call.

[AndreMiras]

Ok thanks for the context, no strong feelings at all. I was just curious about what made you change from your original implementation idea