CI: Use `buildx imagetools create` for multi-arch image copying #37

	name: CI

	on:
	push:
	branches:
	- main
	pull_request:

	env:
	POETRY_VERSION: 1.8.2
	GHCR_IMAGE_REPOSITORY: ghcr.io/${{ github.repository_owner }}/poetry
	PLATFORMS: linux/amd64,linux/arm64/v8

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python:
	- "3.8"
	- "3.9"
	- "3.10"
	- "3.11"
	- "3.12"
	variant:
	- bookworm
	- slim
	steps:
	- uses: actions/checkout@v4.1.1
	- name: Build Docker Image
	uses: docker/build-push-action@v5.1.0
	with:
	context: .
	push: false
	tags: test-image
	target: test
	build-args: POETRY_VERSION=${{ env.POETRY_VERSION }}
	- name: Run Tests in Docker
	run: \|
	docker run --rm \
	-e POETRY_VERSION=${{ env.POETRY_VERSION }} \
	test-image python3 /usr/src/app/tests.py
	- name: Log in to GitHub Container Registry
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Set up multiplatform builds
	uses: docker/setup-qemu-action@v3
	with:
	platforms: ${{ env.PLATFORMS }}
	- name: Set up buildx
	uses: docker/setup-buildx-action@v3
	- name: Build and Push Docker Image
	uses: docker/build-push-action@v5.1.0
	with:
	context: .
	push: true
	tags: ${{ env.GHCR_IMAGE_REPOSITORY }}:${{ github.sha }}-${{ matrix.python }}-${{ matrix.variant }}
	platforms: ${{ env.PLATFORMS }}
	cache-from: type=gha
	cache-to: type=gha,mode=max
	build-args: \|
	POETRY_VERSION=${{ env.POETRY_VERSION }}
	PYTHON_VERSION=${{ matrix.python }}
	VARIANT=${{ matrix.variant }}

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