Issue

If running a job that uses a container like the below, the file /github/home/.gitconfig will not exist, even after checkout runs a config command.

  example:
    runs-on: ubuntu-latest
    container:
      image: alpine

Here is a demo:

1. Checkout runs, and runs /usr/bin/git config --global --add safe.directory /__w/sat/sat
2. The global .gitconfig does not exist
3. Any calls to git remain unsafe/dubious

The safe.directory settings set by the command git config --global --add safe.directory <path> is a no-op.

Workaround

Use the --system scope over --global:

$ git config --system --add safe.directory <path>

  example:
    runs-on: ubuntu-latest
    container:
      image: alpine

    steps:
      - uses: actions/checkout@v3
      - run: git config --system --add safe.directory <path>