Bump JAVA_VERSION to 21 to make sure the alpine base image is multi-p… #1

	name: ci

	on:
	push:
	tags:
	- '*'

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	- name: Login to Docker Hub
	uses: docker/login-action@v3
	with:
	username: ${{ vars.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Extract version parts
	id: version
	run: \|
	VERSION="${{ github.ref_name }}"
	MAJOR="${VERSION%%.*}"
	MINOR="${VERSION%.*}"
	MINOR="${MINOR#*.}"
	echo "MAJOR=$MAJOR" >> $GITHUB_ENV
	echo "MINOR=$MAJOR.$MINOR" >> $GITHUB_ENV
	echo "FULL_VERSION=$VERSION" >> $GITHUB_ENV

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	platforms: linux/amd64,linux/arm64
	push: true
	tags: \|
	atomgraph/fuseki:latest
	atomgraph/fuseki:${{ env.FULL_VERSION }}
	atomgraph/fuseki:${{ env.MINOR }}
	atomgraph/fuseki:${{ env.MAJOR }}

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