Improve checkstyle with license header and import rules #303

	name: Pull Request

	on:
	pull_request:
	branches:
	- 'master'
	- 'hotfix/v..*'

	jobs:
	back-end:
	name: Build back-end
	runs-on: ubuntu-latest
	steps:
	- name: Checkout project
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up JDK 21
	uses: actions/setup-java@v4
	with:
	java-version: '21'
	distribution: 'temurin'
	cache: maven

	- name: Check style
	run: mvn checkstyle:check

	- name: Build
	run: mvn clean package -P production

	- name: Publish test report
	if: always()
	uses: mikepenz/action-junit-report@v5
	with:
	report_paths: 'target/surefire-reports/TEST-*.xml'

	- name: Upload
	uses: actions/upload-artifact@v4
	with:
	name: jar
	path: ${{ github.workspace }}/target/suricate.jar

	- name: Sonar
	run: mvn verify sonar:sonar -DcentralAnalyzerEnabled=false
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

	front-end:
	name: Build front-end
	runs-on: ubuntu-latest
	steps:
	- name: Checkout project
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Node.js 20.x
	uses: actions/setup-node@v4
	with:
	node-version: '20.x'

	- name: Build
	run: \|
	npm install --no-progress
	npm run build -- --configuration production

	- name: Lint
	run: npm run lint

	- name: Test
	run: npm run test-ci

	docker:
	name: Docker
	runs-on: ubuntu-latest
	needs: [ front-end, back-end ]
	steps:
	- name: Checkout project
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up JDK 21
	uses: actions/setup-java@v4
	with:
	java-version: '21'
	distribution: 'temurin'
	cache: maven

	- name: Docker
	run: mvn package -P production -DskipTests jib:dockerBuild

Provide feedback