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Pants

I see the `build_file_dir()` symbol in BUILD files.. is there one for like project root?

If I have this target in `third_party/balena`

```run_shell_command(
    name="login",
    command="XDG_CONFIG_DIRS=${CHROOT}:$XDG_CONFIG_DIRS {chroot}/balena-cli/balena login --web",
    workdir="/",
    execution_dependencies=[":balena-at-root"],
) ```
I'd like workdir to always be the root of the project.