Update README and add CITATION file #35

	## Check here for sequential workflow configuration
	## https://www.r-bloggers.com/2020/07/running-github-actions-sequentially/
	name: docker

	on:
	push:
	branches:
	- main

	jobs:
	build-docker-and-push:
	runs-on: ubuntu-latest
	steps:
	-
	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.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
	-
	name: Build and push
	id: docker_build
	uses: docker/build-push-action@v2
	with:
	ref: ${{ github.event.client_payload.sha }}
	push: true
	tag_with_ref: true
	tag_with_sha: true
	tags: jorainer/xcms_tutorials:RELEASE_3_19
	-
	name: Image digest
	run: echo ${{ steps.docker_build.outputs.digest }}

	- name: Trigger next workflow
	if: success()
	uses: peter-evans/repository-dispatch@v1
	with:
	token: ${{ secrets.REPO_GHA_PAT }}
	repository: ${{ github.repository }}
	event-type: trigger-workflow-2
	client-payload: '{"ref": "${{ github.ref }}", "sha": "${{ github.sha }}"}'

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