Feature Request: Option to supply mypy output as an argument

[aebrahim]

We run mypy in a container to carefully control dependencies in GitHub actions. It would be very cool if we could just pass in the output of that step, and use this action to add inline annotations.

[amilcarlucas]

The output of mypy is availabe using this fork: https://github.com/amilcarlucas/mypy-github-action/releases