add overview picture #167

	# ref: https://github.com/crazy-max/diun/blob/master/.github/workflows/build.yml

	name: Docker

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

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Prepare
	id: prepare
	run: \|
	DOCKER_IMAGE=${{ secrets.DOCKER_IMAGE }}
	VERSION=latest
	SHORTREF=${GITHUB_SHA::8}

	# If this is git tag, use the tag name as a docker tag
	if [[ $GITHUB_REF == refs/tags/* ]]; then
	VERSION=${GITHUB_REF#refs/tags/v}
	fi
	TAGS="${DOCKER_IMAGE}:${VERSION},${DOCKER_IMAGE}:${SHORTREF}"

	# If the VERSION looks like a version number, assume that
	# this is the most recent version of the image and also
	# tag it 'latest'.
	if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
	TAGS="$TAGS,${DOCKER_IMAGE}:latest"
	fi

	# Set output parameters.
	echo ::set-output name=tags::${TAGS}
	echo ::set-output name=docker_image::${DOCKER_IMAGE}

	- name: Environment
	run: \|
	echo home=$HOME
	echo git_ref=$GITHUB_REF
	echo git_sha=$GITHUB_SHA
	echo image=${{ steps.prepare.outputs.docker_image }}
	echo tags=${{ steps.prepare.outputs.tags }}

	# https://github.com/actions/checkout
	- name: Checkout
	uses: actions/checkout@v2

	- name: Docker Login
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1

	- name: Build and push
	uses: docker/build-push-action@v2
	with:
	context: .
	file: ./Dockerfile
	push: true
	tags: ${{ steps.prepare.outputs.tags }}

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