Update README.md #2

	name: Docker Image CD

	on:
	push:
	branches: [ "master" ]
	workflow_dispatch:
	inputs:
	docker-tagname:
	description: Tag name of the Docker image
	default: 'ocrd/sbb_binarization'

	env:
	DOCKER_TAGNAME: ${{ github.evenv.inputs.docker-tagname \|\| 'ocrd/sbb_binarization' }}

	jobs:

	build:

	runs-on: ubuntu-latest
	permissions:
	packages: write
	contents: read

	steps:
	- uses: actions/checkout@v4
	- # Activate cache export feature to reduce build time of image
	name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2
	- name: Build the Docker image
	run: make docker DOCKER_TAG=${{ env.DOCKER_TAGNAME }}
	- name: Login to Dockerhub
	uses: docker/login-action@v2
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_PASSWORD }}
	- name: Push image to Dockerhub
	run: docker push ${{ env.DOCKER_TAGNAME }}
	- name: Alias the Docker image for GHCR
	run: docker tag ${{ env.DOCKER_TAGNAME }} ghcr.io/${{ github.repository }}
	- name: Login to GitHub Container Registry
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Push image to Github Container Registry
	run: docker push ghcr.io/${{ github.repository }}

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