doc: Explain differencs in CWD when run in a composite action #368
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This documents an easy to make mistake regarding how to require a resource from the action's source. When a relative
path is used, the CWD is the workflow's not the composite action's. This surfaces to calling workflows as a
MODULE_NOT_FOUND
error.With respect to the code-sample, ideally we'd use the
github.action_path
(or soon,github.host-workspace
) context in our example. But until actions/runner#2517 is completed, at this time it's safer to useprocess.env.GITHUB_ACTION_PATH
which is correct regardless of how the action is invoked.