Problem:
Inherently, github actions has no information about the code within the repo it's being run in. To rid that problem, there is the actions/checkout workflow that is the defacto start of most workflows.
Our enterprise account got locked down to only local actions only:

Because of this, we are not able to use the actions/checkout@v2 at the start of our workflow, thus rendering our Github Actions useless.
Proposed Solution
Fork the actions/checkout repo as a submodule of a repo and use that reference in my code like so:
steps:
- uses: <enterprise_name>/<repo_name>/checkout@main
When running this action as a test, I get this error message:
Error: Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under
'/home/runner/work/_actions/<enterprise_name>/<repo_name>/main/checkout'.
Did you forget to run actions/checkout before running your local action?
So my question:
Is there a way to run a forked or local version of actions/checkout? The above example is telling me, I can't run a local version of actions/checkout because I have clone the repo which is ironic error.