Describe the bug

Recent versions of git require the .git folder to be owned by the same user. (as described here).

The actions/checkout action sets this for the cloned repo (/usr/bin/git config --global --add safe.directory …). Also see actions/checkout#766

Running a container (via uses: docker://…) however switches the user context and all git commands will fail with an error:

fatal: detected dubious ownership in repository at '/github/workspace'
To add an exception for this directory, call:

	git config --global --add safe.directory /github/workspace

Inspecting the docker run command the HOME variable is set and the home inside the container seems to be /github/home which is mapped to /home/runner/work/_temp/_github_home.
Creating the .gitconfig in this location before running the container resolves this problem:

- name: Fix git safe.directory in container
  run: mkdir -p /home/runner/work/_temp/_github_home && printf "[safe]\n\tdirectory = /github/workspace" > /home/runner/work/_temp/_github_home/.gitconfig

As these paths (HOME and PWD inside the container) are not stable and can be changed any time, the git config … logic should be done by the runner executing the docker command as its the only part in the process knowing these paths.

I do not think this is related to the images as the uses: docker:// logic is handled by the runner itself?

To Reproduce
Steps to reproduce the behavior:

Create this minimal workflow and let it run

on:
  push:

jobs:
  fails:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - uses: docker://docker.io/library/alpine:3.14
        with:
          entrypoint: /bin/ash
          args: -c "apk add git && git status"

(See above for the error message of the git command)

Expected behavior

The container should have a .gitconfig to run git commands normally like it is possible without container.
Stuff like the .git folder is mounted to the container too so a user can expect git to work fine.

Runner Version and Platform

Version of your runner? Hosted Runners on GitHub