Updated instructions and demo compose file #6

	name: Build and Publish to GHCR

	on:
	push:
	tags:
	- 'v..*'
	- 'v..-'

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	permissions: read-all

	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0 # Shallow clones should be disabled for a better relevancy of analysis

	- name: Extract tag name
	run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV

	- uses: sonarsource/sonarqube-scan-action@master
	env:
	SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
	SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
	with:
	args: -Dsonar.projectVersion=${{ env.VERSION }}

	- name: Extract tag name and check if pre-release
	run: \|
	echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
	if [[ "${GITHUB_REF#refs/tags/}" == - ]]; then
	echo "PRERELEASE=true" >> $GITHUB_ENV
	else
	echo "PRERELEASE=false" >> $GITHUB_ENV
	fi

	- name: Log in to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GHCR_PAT }}

	- name: Build and push version-tagged Docker image
	uses: docker/build-push-action@v2
	with:
	push: true
	tags: ghcr.io/${{ github.repository }}:${{ env.VERSION }}

	- name: Build and push latest Docker image
	if: env.PRERELEASE == 'false'
	uses: docker/build-push-action@v2
	with:
	push: true
	tags: ghcr.io/${{ github.repository }}:latest

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