fix: remove top level package-lock.json #392

	# Setup an action to run the backend CI for PRs

	# name of the action
	name: Backend CI

	# when should it run
	on:
	pull_request:
	branches:
	- main

	# what should it do
	jobs:
	# name of the job
	build:
	# what should it run on
	runs-on: ubuntu-latest
	# default values for all the steps
	defaults:
	run:
	working-directory: backend
	permissions:
	contents: read
	packages: read
	# To report GitHub Actions status checks
	statuses: write
	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Setup Java
	uses: actions/setup-java@v4
	with:
	distribution: 'temurin'
	java-version: '21'
	- name: Cache local Maven repository
	uses: actions/cache@v3
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven-
	- name: Run Maven build
	run: mvn install -DskipTests -q
	- name: Run tests
	run: mvn test -q

	- name: Run check style
	uses: nikitasavinov/checkstyle-action@master
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	reporter: 'github-pr-check'
	tool_name: 'testtool'
	fail_on_error: true
	level: warning,error
	workdir: backend

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