[ENH] - Use `git archive` to fetch `conda-project.yml` instead of clone

[aktech]

Feature description

As pointed out by @krassowski here: https://github.com/nebari-dev/jhub-apps/pull/445#discussion_r1745160316

This is relevant after this is merged: https://github.com/nebari-dev/jhub-apps/pull/445

Value and/or benefit

Would be faster to fetch single file from a repository instead of cloning the fully repository.

Anything else?

No response