git.exc.InvalidGitRepositoryError with wrong repo directory

[Singwai]

 Downloading https://files.pythonhosted.org/packages/b9/63/df50cac98ea0d5b006c55a399c3bf1db9da7b5a24de7890bc9cfd5dd9e99/certifi-2019.11.28-py2.py3-none-any.whl (156kB)
Collecting urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1
  Downloading https://files.pythonhosted.org/packages/b4/40/a9837291310ee1ccc242ceb6ebfd9eb21539649f193a7c8c86ba15b98539/urllib3-1.25.7-py2.py3-none-any.whl (125kB)
Collecting chardet<3.1.0,>=3.0.2
  Downloading https://files.pythonhosted.org/packages/bc/a9/01ffebfb562e4274b6487b4bb1ddec7ca55ec7510b22e4c51f14098443b8/chardet-3.0.4-py2.py3-none-any.whl (133kB)
Collecting idna<2.9,>=2.5
  Downloading https://files.pythonhosted.org/packages/14/2c/cd551d81dbe15200be1cf41cd03869a46fe7226e7450af7a6545bfc474c9/idna-2.8-py2.py3-none-any.whl (58kB)
Installing collected packages: smmap2, gitdb2, GitPython, wrapt, deprecated, pyjwt, certifi, urllib3, chardet, idna, requests, six, PyGithub
    Running setup.py install for wrapt: started
    Running setup.py install for wrapt: finished with status 'done'
    Running setup.py install for PyGithub: started
    Running setup.py install for PyGithub: finished with status 'done'
Successfully installed GitPython-3.0.5 PyGithub-1.44.1 certifi-2019.11.28 chardet-3.0.4 deprecated-1.2.7 gitdb2-2.0.6 idna-2.8 pyjwt-1.7.1 requests-2.22.0 six-1.13.0 smmap2-2.0.5 urllib3-1.25.7 wrapt-1.11.2
python /home/runner/work/_actions/peter-evans/create-pull-request/v1/dist/src/create-pull-request.py
Traceback (most recent call last):
  File "/home/runner/work/_actions/peter-evans/create-pull-request/v1/dist/src/create-pull-request.py", line 233, in <module>
    repo = Repo(os.getcwd())
  File "/opt/hostedtoolcache/Python/3.8.0/x64/lib/python3.8/site-packages/git/repo/base.py", line 184, in __init__
    raise InvalidGitRepositoryError(epath)
git.exc.InvalidGitRepositoryError: /home/runner/work/react-ui/react-ui

I got the above error when trying to trigger the action.

I think this is related to this issue.

gitpython-developers/GitPython#255

Which can be fixed by changing this line.
https://github.com/peter-evans/create-pull-request/blob/master/src/create-pull-request.py#L233

[peter-evans]

@Singwai Thank you for reporting this issue and finding a fix.

I'm interested to know how to reproduce this error so I can test the fix. What does your workflow look like? Somehow you are executing the action in a directory that isn't the root of the repository and doesn't contain a .git directory?