Setup java 17 and cleanup in Dockerfiles. #151

	name: Docker Image

	on:
	push:
	branches:
	- 'master'
	- 'dev'
	tags:
	- 'v*'

	jobs:
	docker:
	runs-on: ubuntu-latest

	steps:
	-
	name: Checkout
	uses: actions/checkout@v4
	-
	name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	-
	name: Log in to Docker Hub
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}
	-
	name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ipbhalle/metfragweb
	tags: \|
	# tag event
	type=ref,event=tag
	# set latest tag for main branch and tags
	type=raw,value=latest,enable=${{ github.ref == 'refs/heads/master' \|\| startsWith(github.ref, 'refs/tags/') }}
	# set dev tag for dev branch
	type=raw,value=dev,enable=${{ github.ref == 'refs/heads/dev'}}
	-
	name: Maven Build Cache for Docker
	uses: actions/cache@v4
	with:
	path: maven-cache
	key: ${{ runner.os }}-maven-cache-${{ hashFiles('**/pom.xml') }}
	-
	name: Inject Maven Build Cache into Docker
	uses: reproducible-containers/[email protected]
	with:
	cache-map: \|
	{
	"maven-cache": "/root/.m2"
	}

	- name: Build and push Docker image
	uses: docker/build-push-action@v6
	with:
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	cache-from: type=gha
	cache-to: type=gha,mode=max
	# cache-from: type=registry,ref=ipbhalle/metfragweb:buildcache
	# cache-to: type=registry,ref=ipbhalle/metfragweb:buildcache,mode=max

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