Fix unique key violation exception when concurrent group patch requests trying to add same users to the group #468

	# This workflow will build the project on pull requests with tests
	# Uses:
	# OS: ubuntu-lates
	# JDK: Adopt JDK 11 and Adopt JDK 17

	name: PR Builder

	on:
	pull_request:
	branches: [main, master]
	workflow_dispatch:

	env:
	MAVEN_OPTS: -Xmx4g -Xms1g

	jobs:
	build:
	runs-on: ubuntu-latest

	env:
	JAVA_TOOL_OPTIONS: "-Djdk.util.zip.disableZip64ExtraFieldValidation=true -Djdk.nio.zipfs.allowDotZipEntry=true"

	strategy:
	matrix:
	java-version: [ 11, 17 ]

	steps:
	- uses: actions/checkout@v2
	- name: Set up Adopt JDK 11 and 17
	uses: actions/setup-java@v2
	with:
	java-version: ${{ matrix.java-version }}
	distribution: "adopt"
	- name: Cache local Maven repository
	id: cache-maven-m2
	uses: actions/cache@v2
	env:
	cache-name: cache-m2
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ env.cache-name }}-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven-${{ env.cache-name }}-
	${{ runner.os }}-maven-
	${{ runner.os }}-
	- name: Build with Maven
	run: mvn clean install -U -B

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