Update from https://github.com/riazarbi/datasci-r-8020/commit/8abf5d7… #68

	name: docker_build

	on:
	workflow_dispatch:
	push:
	branches:
	- 'focal'

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	-
	name: Checkout
	uses: actions/checkout@v2
	-
	name: Set up QEMU
	uses: docker/setup-qemu-action@v1
	-
	name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1
	-
	name: Login to DockerHub
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}
	-
	name: Generate tag
	id: gen_tag
	run: \|
	TAG=$(printf '%(%Y%m%d%H%M%S)T\n' -1)
	echo '::set-output name=tag::'$TAG
	-
	name: Build and push
	uses: docker/build-push-action@v2
	with:
	context: .
	push: true
	tags: \|
	riazarbi/datasci-r-heavy:${{ fromJson(steps.gen_tag.outputs.tag) }}
	riazarbi/datasci-r-heavy:focal

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