[ci] containerized CI jobs failing: "unsafe repository"

[jameslamb]

Description

I see several CI jobs failing with on master with the following exception.

Error: fatal: unsafe repository ('/__w/LightGBM/LightGBM' is owned by someone else)
  To add an exception for this directory, call:
  
  	git config --global --add safe.directory /__w/LightGBM/LightGBM
  Error: The process '/usr/bin/git' failed with exit code 1[28](https://github.com/microsoft/LightGBM/runs/6016954524?check_suite_focus=true#step:3:28)

Reproducible example

The following containerized GitHub Actions jobs are failing:

• r-sanitizers (ubuntu-latest, R-devel, gcc ASAN/UBSAN) (build link)
• r-sanitizers (ubuntu-latest, R-devel, clang ASAN/UBSAN) (build link)
• r-package-check-docs (build link)

Additional Comments

This looks like a known issue caused by recent GitHub changes made in response to a security vulnerability: actions/checkout#760

I'll review that issue and put up a PR to fix this.

[github-actions]

This issue has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.