Cannot access the .git using this buildpack?

[cheapsteak]

Hi there

I'm struggling with running some git commands while using this buildpack

$(git show -s --format=%cd --date=short)--$(git rev-parse HEAD)

results in

fatal: not a git repository (or any of the parent directories): .git

Is there a config option that I might be missing, or is it a limitation of the buildpack that the .git directory is not accessible?

Hoping I might possibly be missing something obvious 🙏 (otherwise please consider this a feature request to make the .git directory available to build scripts)