Add terraformworkspaceid.py

[kyanny]

@gm3dmo

Extract Terraform Workspace ID from gheboot output and append it to the environment JSON file.

This python script accepts input like below.

@kyanny
, :wave:
You've requested GHES 3.10.3 single-node resources in australiaeast on azure with setup.
You can follow your instance creation @ https://terraform.githubapp.com/app/ghes/workspaces/gheboot-kyanny-1716187058841/runs/run-PNAKUxRcwBjyNF1T. (If this is your first time launching a GHEBoot instance via Terraform you will need to log into Terraform Enterprise from the Okta tile before this link will work)
We've set the name of this request to gheboot-kyanny-1716187058841 and your Terraform workspace is: gheboot-kyanny-1716187058841 (ws-v8whx1M2tBoYcNeC) and we've used the key in position 0 in your profile in GitHub.com for SSH access to this instance.
Just FYI, the reqested instance(s) will expire on 2024-05-22.

It extracts Terraform Workspace ID (e.g. ws-v8whx1M2tBoYcNeC in the above example input) and append it to the environment JSON file.

Terraform Workspace ID is needed in later to run some chatops such as .gheboot change-ttl so having it in the environment JSON file would be a good idea.

The script is supposed to run after ghe2json.py. If ghe2json.py hasn't executed, the environment JSON file doesn't exist. So that this script will abort with exception.

This script is developed based on ghe2json.py so that there are duplicated function definitions. I will do a refactoring in later (extracts these utility functions into thepower.py)