github: add mypy workflow #5

	name: reviewdog
	on: [pull_request]
	jobs:
	mypy:
	name: runner / mypy
	runs-on: ubuntu-latest
	steps:
	- run: pip install mypy
	- uses: actions/checkout@v4
	- uses: tsuyoshicho/action-mypy@v4
	with:
	github_token: ${{ secrets.github_token }}
	# Change reviewdog reporter if you need [github-pr-check,github-check,github-pr-review].
	reporter: github-pr-review
	# Change reporter level if you need.
	# GitHub Status Check won't become failure with warning.
	level: warning
	# Change the current directory to run mypy command.
	# mypy command reads setup.cfg or other settings file in this path.
	workdir: .

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