Bump actions/checkout from 3 to 4 #35

	name: Publish Docker image
	on:
	push:
	branches:
	- main
	tags:
	- 'v..*'

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

	jobs:
	push_to_registry:
	name: Push Docker image to GitHub Packages
	runs-on: ubuntu-latest
	permissions:
	packages: write
	contents: read
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v2
	with:
	platforms: all
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2
	with:
	config: .github/buildkitd.toml
	- name: Login to DockerHub
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Retrieve author data
	run: \|
	echo AUTHOR=$(curl -sSL ${{ github.event.repository.owner.url }} \| jq -r '.name') >> $GITHUB_ENV
	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v4
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	labels: \|
	org.opencontainers.image.authors=${{ env.AUTHOR }}
	- name: Build container image
	uses: docker/build-push-action@v4
	with:
	context: .
	platforms: linux/amd64
	push: true
	cache-from: type=gha
	cache-to: type=gha,mode=max
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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