When a user selects GitHub workflows as the backend for his action, if he is using GitHub SaaS (and not an on-prem installation of GitHub), once he fills in the organization, repository and workflows file fields in the backend tab, we can already know what file he is referring to, so we can add a button to the UI form that takes the user to the file.

This will make it easier to align the inputs sent to the workflow, and it can also help verify that the file actually exists (as if the URL will take the user to GitHub's 404 page, the user will know that he used the wrong information to reference the workflow file)