github: add mypy workflow #1

	- name: Mypy action
Check failure on line 1 in .github/workflows/mypy-action.yml View workflow run for this annotation GitHub Actions / .github/workflows/mypy-action.yml Invalid workflow file `You have an error in your yaml syntax on line 1`
	uses: sasanquaneuf/mypy-github-action@releases/v1.3

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