Bump actions/download-artifact from 3 to 4 (#566) #777

	---
	name: Docker

	on:
	push:
	# Publish `master` as Docker `latest` image.
	branches:
	- master

	# Publish `v1.2.3` tags as releases.
	tags:
	- v*

	# Run tests for any PRs.
	pull_request:

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	jobs:
	# Run tests.
	# See also https://docs.docker.com/docker-hub/builds/automated-testing/
	test:
	runs-on: ubuntu-22.04

	steps:
	- uses: actions/checkout@v4

	- name: Run tests
	run: \|
	if [ -f docker-compose.test.yml ]; then
	docker-compose --file docker-compose.test.yml build
	docker-compose --file docker-compose.test.yml run sut
	else
	docker build . --file Dockerfile
	fi

	push:
	needs: test

	runs-on: ubuntu-22.04
	if: github.event_name == 'push'

	steps:
	- uses: actions/checkout@v4

	- name: Log into GitHub Container Registry
	uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@31cebacef4805868f9ce9a0cb03ee36c32df2ac4
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

	- name: Build and push Docker image
	uses: docker/build-push-action@4a13e500e55cf31b7a5d59a38ab2040ab0f42f56
	with:
	context: .
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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