Terraform Orb - Provide a working directory parameter

[steinybot]

Terraform will only load terraform.tfvars or *.auto.tfvars from the current working directory (see hashicorp/terraform#16197).

There needs to be a parameter to specify the working directory to workaround this "expected behaviour".

[danielflookovo]

CircleCI has working_directory parameters for changing the working directory, so we avoided a conflicting option. This means the working directory will most likely be the root of the checked out repo.

I'd suggest using the var/var_file parameters instead or relying on the auto loading behaviour.

This might get changed in the future. I think this should be addressed by making the auto loading work as expected, based on the path parameter.