Update README.md #113

	name: docker-build-and-push-edge

	on:
	push:
	branches:
	- 'master'

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	-
	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: Build and push
	id: docker_build
	uses: docker/build-push-action@v2
	with:
	push: true
	tags: citygml4j/citygml-tools:edge
	-
	name: Image digest
	run: echo ${{ steps.docker_build.outputs.digest }}

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