Change synchronized on FileSystemContext to avoid deadlock #17331

	# This is a basic workflow to help you get started with Actions

	name: Checkstyle, Findbugs, Doc Check, etc.

	on:
	pull_request:
	schedule:
	- cron: 0 0 * * *

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- name: checkout repo
	uses: actions/checkout@v2

	- name: Use Node.js ${{ matrix.node-version }}
	uses: actions/setup-node@v1
	with:
	node-version: '10.11.0'

	- name: Cache local Maven repository
	uses: actions/cache@v2
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven-

	- name: Execute license check, checkstyle, findbugs
	run: \|
	mkdir -p ~/.m2
	ALLUXIO_DOCKER_NO_TTY=true \
	ALLUXIO_DOCKER_GIT_CLEAN=true \
	ALLUXIO_DOCKER_MVN_RUNTOEND=true \
	ALLUXIO_CHECKSTYLE=true \
	dev/github/run_docker.sh "\"-Dtest=${{ matrix.modules }}\"" -pl tests
	timeout-minutes: 60

	- name: Archive artifacts
	continue-on-error: true
	uses: actions/upload-artifact@v2
	if: always()
	with:
	name: artifact
	path: \|
	*/target/artifacts/
	*/target/logs/
	log*
	retention-days: 7

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