Merge pull request #225 from C2DH/develop #37

	name: Build and publish Docker image for Release
	on:
	# Trigger the workflow on push or pull request,
	# for the develop branch and all new tags
	push:
	tags:
	- v*
	- preview-*
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@master
	- name: Fetch Prune Unshallow Tags
	run: git fetch --prune --unshallow --tags
	- name: Extract branch name
	shell: bash
	run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
	id: extract_branch
	- name: Extract commit hash
	shell: bash
	run: echo "##[set-output name=hash;]$(git rev-parse --short ${GITHUB_SHA})"
	id: extract_hash
	- name: Extract latest tag
	shell: bash
	run: echo "RELEASE_VERSION="$(git describe --tags --abbrev=0 ${GITHUB_SHA}) >> $GITHUB_ENV
	- name: Publish to Registry
	uses: elgohr/Publish-Docker-Github-Action@master
	env:
	GIT_TAG: "${{ env.RELEASE_VERSION }}"
	GIT_BRANCH: ${{ steps.extract_branch.outputs.branch }}
	GIT_REVISION: ${{ steps.extract_hash.outputs.hash }}
	with:
	name: c2dhunilu/journal-of-digital-history-backend
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_PASSWORD }}
	buildargs: GIT_BRANCH,GIT_REVISION
	tags: "${{ env.RELEASE_VERSION }}"

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