feat: v4 #958

	name: Docker

	on:
	push:
	branches: ["main"]
	# Publish semver tags as releases.
	tags: ["v..*"]
	pull_request:
	branches: ["main"]

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

	jobs:
	docker-build:
	runs-on: ubuntu-latest
	steps:
	# Checkout the repo
	- name: Checkout repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	# Set up QEMU for Arm64
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

	# Set up Docker Buildx
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	# Login into GitHub Container Registry except on PR
	- name: Log into registry ${{ env.REGISTRY }}
	# if: github.event_name != 'pull_request' # TODO: enable
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	# Extract metadata (tags, labels) for Docker
	- name: Extract Docker metadata (release)
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	flavor: \|
	latest=auto
	tags: \|
	type=semver,pattern={{version}}
	type=raw,value=v4 # TODO: change back to dev

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	platforms: linux/amd64 # TODO: enable arm
	# push: ${{ github.event_name != 'pull_request' }} # TODO: enable
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	context: .
	# cache builds in github actions
	cache-from: type=gha
	cache-to: type=gha,mode=max
	# better compression
	outputs: type=image,oci-mediatypes=true,compression=zstd,compression-level=3,force-compression=true

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