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1. In the github organization settings, we can specify 'runner groups'. Where each group can take jobs from any workflow, or certain workflows chosen by administrator. 
   1. This could be useful if we want 'nightly builds' to be their own group, so there will always be runners available in other runner groups. 
   2. You could also add labels to the runners, and then on the workflow job yaml you can specify the label to determine which runner to run on.
   3. Choosing the runner for a job - GitHub Docs