Revert "fix: appease the git directory ownership check"

[hwkns]

Reverts #9

error: could not lock config file /etc/gitconfig: Permission denied

Continuing to investigate... Seems like we shouldn't have to run this command ourselves anyway, because...

1. the checkout@v3 action has a default-true option to add the safe directory git config...

    # Add repository path as safe.directory for Git global config by running `git
    # config --global --add safe.directory <path>`
    # Default: true
    set-safe-directory: ''

2. the gitleaks docker image has a RUN step to set it as well...

    RUN /bin/sh -c git config --global --add safe.directory '*' # buildkit

Working my way through the many comments on actions/runner-images#6775