Update readme for new selector setup. #78

	name: Container Image Build

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

	env:
	# Use docker.io for Docker Hub if empty
	REGISTRY: ghcr.io
	# github.repository as <account>/<repo>
	IMAGE_NAME: ${{ github.repository }}


	jobs:
	build:

	runs-on: ubuntu-22.04
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout repository
	uses: actions/checkout@v3.5.3

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v2

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	# Login against a Docker registry except on PR
	# https://github.com/docker/login-action
	- name: Login to GitHub Container Registry
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v2.2.0
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	# Extract metadata (tags, labels) for Docker
	# https://github.com/docker/metadata-action
	- name: Extract Docker metadata
	id: metadata
	uses: docker/metadata-action@v4.6.0
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

	# Build and push Docker image with (don't push on PR)
	# https://github.com/docker/build-push-action
	- name: Build and push Docker image
	uses: docker/build-push-action@v4.1.1
	with:
	context: .
	platforms: linux/amd64
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.metadata.outputs.tags }}
	labels: ${{ steps.metadata.outputs.labels }}

	- name: Echo Build Stats
	run: \|
	echo "TAG: ${{ steps.metadata.outputs.tags }}"

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