[CI] Add a workflow to check codestyle by run `pre-commit` #3

	name: CodeStyle Check

	on:
	push:
	branches: [dygraph]
	pull_request:
	merge_group:
	workflow_dispatch:

	jobs:
	codestyle-check:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	# Only run linter and formatter on minimum supported Python version
	python-version: ["3.8"]
	architecture: ["x64"]
	name: CodeStyle Check - Python ${{ matrix.python-version }} on ${{ matrix.architecture }}
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Install pre-commit
	run: pipx install pre-commit

	- name: Install python
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	architecture: ${{ matrix.architecture }}

	- uses: actions/cache@v4
	with:
	path: ~/.cache/pre-commit
	key: pre-commit-3\|${{ env.pythonLocation }}\|${{ hashFiles('.pre-commit-config.yaml') }}

	- name: Run pre-commit
	# Check only the files that have been changed in the PR
	# Ref: https://github.com/pre-commit/action/issues/7#issuecomment-1251300704
	run: pre-commit run --show-diff-on-failure --color=always --from-ref ${{ github.event.pull_request.base.sha }} --to-ref ${{ github.event.pull_request.head.sha }}

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