The latest push doesn't makes sense, even if it was working (which it's not). I suspect it's not working because of permission issues. But regardless, it would be testing the wrong version of the reusable actions because the nightly-build.yaml workflow on the Template repo points to the main branch of this repo.

We need these tests to actually use the versions of all the workflows in the PR, not in main.

My first approach is probably better, re: checking out the Template repo code and running the tests locally. But I don't know how to run the build-book.yaml job after checking out the Template code.