add shoot comparator build #4

	name: shoot-comparator
	on:
	pull_request:
	push:
	branches: [ main ]

	jobs:
	push-to-ghrc:
	runs-on: ubuntu-latest
	permissions:
	packages: write
	contents: read

	steps:
	- name: Checkout
	uses: actions/checkout@v4
	# detect changes in the tests directory that require a new image build
	- uses: dorny/paths-filter@v3
	id: changes
	with:
	filters: \|
	src:
	- 'hack/shoot-comparator/**'
	- '!hack/shoot-comparator/*/.md'

	- name: Log in to the Container registry
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: \|
	ghcr.io/${{ github.repository }}/test-images/shoot-comparator

	- if: \|
	steps.changes.outputs.src == 'true' \|\|
	github.event_name == 'push'

	name: Build and push Docker images
	uses: docker/build-push-action@v5
	with:
	context: ./hack/shoot-comparator
	file: ./hack/shoot-comparator/Dockerfile
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

	- if: \|
	steps.changes.outputs.src == 'false' &&
	github.event_name != 'push'

	name: Tag docker image
	run: \|
	docker pull ghcr.io/${{ github.repository }}/test-images/shoot-comparator:main \
	&& docker tag ghcr.io/${{ github.repository }}/test-images/shoot-comparator:main ghcr.io/${{ github.repository }}/test-images/shoot-comparator:pr-${{ github.event.number }} \
	&& docker push ghcr.io/${{ github.repository }}/test-images/shoot-comparator:pr-${{ github.event.number }}

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