Fix code formatting github action

🐛 Bug description

Currently, auto code formatting GA: https://github.com/pytorch/ignite/actions/workflows/code-style.yml does not on forks and fails while try to commit/push the fix to the fork. This gives a misleading error to the user without helping how to solve it. Currently this action is disabled.

The idea is to find out what is the cause of the failure and fix it if possible.

Environment

• PyTorch Version (e.g., 1.4):
• Ignite Version (e.g., 0.3.0):
• OS (e.g., Linux):
• How you installed Ignite (conda, pip, source):
• Python version:
• Any other relevant information:

[vfdev-5]

Thanks for the info and the link. Shouldn’t we do like in the example: https://github.com/stefanzweifel/git-auto-commit-action#example-2 but adapted for us :

• add pull_request_target

We can inspect what happens in both cases: a) GitHub Action is enabled on the forked repository. b) GitHub Action is disabled on the forked repository.

[trsvchn]

@vfdev-5 After quick view at the stefanzweifel/git-auto-commit-action@v4 I found this recomendation:

You must use action/checkout@v2 or later versions to checkout the repository. In non-push events, such as pull_request, make sure to specify the ref to checkout:

- uses: actions/checkout@v2
  with:
    ref: ${{ github.head_ref }}

And, also, there is a recipe how to use it with forks:

https://github.com/stefanzweifel/git-auto-commit-action#using-the-action-in-forks-from-public-repositories

And this:

For Workflows which runter linters and fixers (like the example above) we recommend running them when a push happens on the master-branch.