Add a default helper #13

	name: Docker Image CI

	on:
	push:
	release:
	types: [published]

	jobs:
	container:
	runs-on: ubuntu-latest
	steps:
	-
	name: Checkout
	uses: actions/checkout@v3
	-
	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: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ github.token }}
	# container names must be lower case
	- name: Image Name
	id: image_name
	uses: ASzc/change-string-case-action@v2
	with:
	string: ${{ github.repository }}
	-
	name: Build and push
	uses: docker/build-push-action@v3
	with:
	context: .
	platforms: linux/amd64,linux/arm64
	push: true
	tags: \|
	ghcr.io/${{ steps.image_name.outputs.lowercase }}:${{ github.sha }}
	ghcr.io/${{ steps.image_name.outputs.lowercase }}:${{ github.ref_name }}

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