add relevant plugins for release #14

	name: Produces and releases artifacts

	on:
	push:
	branches:
	- master

	jobs:
	build:
	runs-on: ubuntu-latest
	name: Build and run tests on JDK ${{ matrix.java }}
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	# Restore the cache first
	- name: Cache .m2
	uses: actions/cache@v1
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven

	# Get GPG private key into GPG
	- name: Import GPG Owner Trust
	run: echo ${{ secrets.GPG_OWNERTRUST }} \| base64 --decode \| gpg --import-ownertrust

	- name: Import GPG key
	run: echo ${{ secrets.GPG_SECRET_KEYS }} \| base64 --decode \| gpg --import --no-tty --batch --yes

	# Setup JDK and .m2/settings.xml
	- name: Set up JDK 11
	uses: actions/setup-java@v1
	with:
	java-version: 11
	server-id: ossrh
	server-username: OSS_CENTRAL_USERNAME # env variable for Maven Central
	server-password: OSS_CENTRAL_PASSWORD # env variable for Maven Central

	# Prepare
	- name: Prepare Maven Wrapper
	run: chmod +x ./mvnw

	# Build
	- name: Build with Maven
	run: ./mvnw clean verify -U -B -T4

	# Publish release
	- name: Deploy a new release version to Maven Central
	run: ./mvnw clean deploy -B -DskipTests -DskipExamples -Prelease -Dgpg.keyname=${{ secrets.GPG_KEYNAME }} -Dgpg.passphrase=${{ secrets.GPG_PASSPHRASE }}
	env:
	OSS_CENTRAL_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
	OSS_CENTRAL_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}

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