ci: add workflow for backend unit tests #10

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	# SPDX-License-Identifier: Apache-2.0
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	---

	name: Unit Test - Backend

	on:
	pull_request:
	branches:
	- main

	jobs:
	unit-test-backend:
	if: github.repository_owner == 'eclipse-tractusx' # prevent running on forks
	runs-on: ubuntu-latest
	permissions:
	packages: write

	steps:
	- name: Checkout
	uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7

	- name: Set up JDK 21
	uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018 # v4.2.2
	with:
	java-version: '21'
	distribution: 'temurin'
	cache: maven

	- name: Build and test with Maven
	run: \|
	cd backend
	mvn clean install

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