Publish OntoUML4j to the Maven Central Repository #21

	name: Publish OntoUML4j to the Maven Central Repository

	on:
	release:
	types: [ created ]

	jobs:
	publish:
	runs-on: ubuntu-latest
	steps:
	# https://docs.github.com/en/actions/use-cases-and-examples/building-and-testing/building-and-testing-java-with-maven
	# https://github.com/actions/setup-java
	- uses: actions/checkout@v4
	- name: Set up JDK
	uses: actions/setup-java@v4
	with:
	java-version: 21
	distribution: 'temurin'
	cache: maven
	# https://central.sonatype.org/publish/generate-portal-token/
	server-id: central
	server-username: MAVEN_CENTRAL_USERNAME
	server-password: MAVEN_CENTRAL_TOKEN
	gpg-private-key: ${{ secrets.GPG_SIGNING_KEY }}
	gpg-passphrase: MAVEN_GPG_PASSPHRASE

	- name: Publish to Maven Central Portal
	# if autoPublish is false (see pom.xml), we need to publish manually via https://central.sonatype.com/publishing/deployments
	run: mvn --batch-mode deploy
	env:
	MAVEN_CENTRAL_USERNAME: ${{ secrets.OSSRH_USERNAME }}
	MAVEN_CENTRAL_TOKEN: ${{ secrets.OSSRH_TOKEN }}
	MAVEN_GPG_PASSPHRASE: ${{ secrets.GPG_PASSWORD }}

Provide feedback