The terraform module does not expect its file contents (project_path) in
the 'files/' folder like the core roles, instead looking for it relative
to the _invocation_ pwd.
So, for now it just resides in the root level of the repository and may
be moved from there to wherever it is more pertinent.
Additionally, we check for the existence of the OpenTofu binary (tofu),
and prefer that if it exists. Otherwise we fall back to the Terraform
binary.
