Add multiarch Docker images #220

	name: Protobuf Docker Image
	on:
	push:
	tags:
	- "**"
	branches:
	- main
	pull_request:
	branches:
	- main
	paths:
	- .github/workflows/protobuf-dockerimage.yml
	- protobuf/Dockerfile
	- protobuf/protoc-wrapper

	jobs:
	build:
	runs-on: ubuntu-latest
	services:
	registry:
	image: registry:2
	ports:
	- 5000:5000
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Docker meta
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: \|
	name=otel/build-protobuf,enable=${{ github.event_name != 'pull_request' }}
	name=localhost:5000/otel/build-protobuf
	tags: \|
	type=edge
	type=ref,event=pr
	type=semver,pattern={{version}}

	- name: Docker Buildx
	uses: docker/setup-buildx-action@v3
	with:
	driver-opts: network=host

	- name: Setup QEMU
	uses: docker/setup-qemu-action@v3
	with:
	platforms: arm64

	- name: DockerHub Login
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}
	if: github.event_name != 'pull_request'

	- name: Build Docker image
	uses: docker/build-push-action@v5
	id: build-push
	with:
	context: "protobuf/."
	cache-from: type=gha,scope=protobuf
	cache-to: type=gha,scope=protobuf,mode=max
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	annotations: ${{ steps.meta.outputs.annotations }}
	platforms: "linux/amd64"
	# platforms: "linux/arm64, linux/amd64"
	push: true
	pull: true
	sbom: true
	provenance: mode=max
	no-cache: ${{ github.event_name != 'pull_request' }}

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