configurable workstation variables

These are taken from our terraform variables for a gcp instance, and it would be helpful to have an analogue of these for an aws workstation.

location/region: "europe-west4" for gcp or the equivalent in aws

instance-type: determines number of cores and memory, linkage possibilities between the ssd and the gpu (NVLink? not super familiar with this part)

project: Not sure if there is an aws analogue, but gcp has project ids, with many projects to one gcp account

gpu-count: 1-4

gpu-type: type of gpu(s) to attach to instance. example would be nvidia-tesla-t4 vs much cheaper, much dinkier Nvidia K80s

### additional variables

EFS Mount s3 prefix path and mount path. I'm not sure what the performance of this would be. How fast is it compared to a local file system? In the past I used https://github.com/s3fs-fuse/s3fs-fuse on our terraform instance, but found it to be too slow. I switched to using the aws cli to sync data to the ssd or using fsspec in my python code to load files directly from the bucket prefixes.