add pull request workflow #4

# to view logs

	# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-maven

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.

	name: pull request build

	on:
	pull_request:
	branches: [ "develop" ]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	java: [ '8' , '11', '17' , '21']
	name: build with Java ${{ matrix.Java }}
	steps:
	- uses: actions/checkout@v4
	- name: Set up Java
	uses: actions/setup-java@v4
	with:
	java-version: ${{ matrix.Java }}
	distribution: 'temurin'
	cache: maven
	- name: run headless maven build
	uses: coactions/setup-xvfb@v1
	with:
	run: mvn -B clean verify javadoc:javadoc
	options: -screen 0 1280x1024x16

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