Add platform matrix for Docker build and push action #8

	name: docker

	on:
	push:
	branches:
	- 'main'
	tags:
	- 'v*'

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

	jobs:
	docker:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	platform: [linux/amd64, linux/arm64, linux/arm/v6, linux/arm/v7]

	permissions:
	contents: read
	packages: write

	steps:
	-
	name: Set up QEMU
	uses: docker/setup-qemu-action@v2
	-
	name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2
	-
	name: Login to GitHub Container Registry
	uses: docker/login-action@v2
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	-
	name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v4
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	-
	name: Build and push
	uses: docker/build-push-action@v4
	with:
	context: "{{defaultContext}}"
	platforms: ${{ matrix.platform }}
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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