I am following this guide to create a button to fire an on-demand workflow. I am stuck on adding the correct JS file. It is not showing in Ribbon Workbench, so I am assuming that I need to add it to my solution first. My trouble is I don't know which JS file that would be. Step 9 on that guide shows it to be "/_static/_common/scripts/RibbonActions.js" but I cannot find that in the solution.
Ribbon Workbench 2016 (via XRM Toolbox):

Solution:

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