Add checkstyle in maven build #7

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	# http://www.apache.org/licenses/LICENSE-2.0
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	# A workflow to java style check
	name: java format check

	on:
	pull_request:
	types: [opened, synchronize, reopened]

	jobs:
	pre-commit:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	submodules: true
	fetch-depth: 0

	- name: Set up JDK
	uses: actions/setup-java@v4.5.0
	with:
	java-version: '8'
	distribution: 'adopt'

	- name: Checkout base branch
	run: git checkout ${{ github.base_ref }}

	- name: Run checkstyle
	run: \|
	echo $(pwd)
	ls -alh $(pwd)
	bash dev/checkstyle.sh

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