Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows #727

	name: Build Docker Images

	on:
	push:
	branches:
	- '**'
	tags:
	- 'v*'
	pull_request:

	jobs:
	push_to_registry:
	runs-on: ubuntu-20.04
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	- name: Docker meta
	id: docker_meta
	uses: crazy-max/ghaction-docker-meta@v1
	with:
	images: ${{ github.repository }}
	tag-semver: \|
	{{version}}
	{{major}}.{{minor}}
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v1
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1
	# - name: Cache Docker layers
	# uses: actions/cache@v2
	# with:
	# path: /tmp/.buildx-cache
	# key: ${{ runner.os }}-buildx-${{ github.sha }}
	# restore-keys: \|
	# ${{ runner.os }}-buildx-
	- name: Login to DockerHub
	id: docker_login
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}
	continue-on-error: true
	- name: Build and push
	id: docker_build
	uses: docker/build-push-action@v2
	with:
	context: .
	file: Dockerfile
	push: ${{ steps.docker_login.outcome == 'success' && github.event_name != 'pull_request' }}
	tags: ${{ steps.docker_meta.outputs.tags }}
	labels: ${{ steps.docker_meta.outputs.labels }}
	# cache-from: type=local,src=/tmp/.buildx-cache
	# cache-to: type=local,dest=/tmp/.buildx-cache
	- name: Image digest
	run: echo ${{ steps.docker_build.outputs.digest }}

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