Use the root POM, fix resulting checkstyle issues #539

	# This workflow will build a Java project with Maven
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven

	name: Java CI with Maven

	on:
	push:
	branches: [ '**' ]
	tags: [ '**' ]
	pull_request:
	branches: [ '**' ]

	jobs:
	build:

	runs-on: ubuntu-22.04

	steps:
	- name: Cache
	uses: actions/cache@v3
	with:
	# A list of files, directories, and wildcard patterns to cache and restore
	path: ~/.m2/repository
	# An explicit key for restoring and saving the cache
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: ${{ runner.os }}-maven-
	- uses: actions/checkout@v3
	- name: Set up JDK 17
	uses: actions/setup-java@v3
	with:
	java-version: 17
	distribution: 'adopt'
	- name: Build with Maven
	run: ./mvnw -B clean install
	- name: code coverage
	run: bash <(curl -s https://codecov.io/bash)

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