Env at the workflow and job level

> Env at the workflow and job level
>
>It is common to need define a set of environment variables that are used in multiple steps in a job and even multiple jobs in a workflow. Now you can add an `env` map at both the workflow and job level. Those environment variables will be merged with the `env` defined at any step lower in the hierarchy

https://github.blog/changelog/2019-10-01-github-actions-new-workflow-syntax-features/#env-at-the-workflow-and-job-level

Start by reading the linked GitHub Actions changelog to understand the workflow- and job-level env syntax. Then inspect the repository's workflow implementation and existing tests, if present, to determine where environment variables are processed; done means workflow- and job-level env values merge correctly with step-level values.

Written by the indexing model from the issue text.