Merge pull request #819 from cjmayo/ref-names #151

	# https://docs.github.com/en/packages/managing-github-packages-using-github-actions-workflows/publishing-and-installing-a-package-with-github-actions#publishing-a-package-using-an-action

	name: Create and publish a Docker image

	on:
	push:
	branches: ['master']
	tags: 'v*'
	workflow_dispatch:

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Log in to the Container registry
	uses: docker/login-action@e92390c5fb421da1463c202d546fed0ec5c39f20 # v3.10
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	flavor: latest=true
	tags: \|
	type=semver,pattern={{version}}
	type=ref,event=branch

	- name: Build and push Docker image
	uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
	with:
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

	- name: Delete oldest Docker images
	uses: actions/delete-package-versions@v5
	with:
	package-name: 'linkchecker'
	package-type: 'container'
	min-versions-to-keep: 20
	delete-only-untagged-versions: 'true'

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