Add ConcurrencyMode Support for StackSet Resource #173


	# This workflow will build a Java project with Maven
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven

	name: Java CI with Maven

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:
	env:
	AWS_DEFAULT_REGION: us-east-1
	AWS_REGION: us-east-1

	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up JDK 1.8
	uses: actions/setup-java@v1
	with:
	java-version: 1.8
	- name: Set up Python 3.8
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- name: Set up cloudformation-cli-java-plugin
	run: pip install cloudformation-cli-java-plugin
	- name: install and run pre-commit
	uses: pre-commit/action@v2.0.0
	with:
	extra_args: --all-files
	- name: Run maven verify for all resources
	run: \|
	for directory in $GITHUB_WORKSPACE/aws-*; do
	cd "$directory"
	mvn -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -B clean verify
	done
	- name: Check failure log
	if: ${{ failure() }}
	run: \|
	for directory in $GITHUB_WORKSPACE/aws-*; do
	cd "$directory"
	if [[ -f "rpdk.log" ]]
	then
	cat "rpdk.log"
	fi
	done
	- name: Failure diff
	if: ${{ failure() }}
	run: git diff

Provide feedback