Update README.md #53

	---
	name: CI

	on:
	push:
	branches:
	- master # Push events on master branch
	pull_request: # Run tests for any PRs

	env:
	IMAGE_NAME: puppet-lint-action

	jobs:
	# Run tests.
	test:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Docker build
	run: docker build . --file Dockerfile --tag image

	- name: Docker run
	run: docker run --entrypoint puppet-lint image -v

	# Push image to GitHub Packages.
	# See also https://docs.docker.com/docker-hub/builds/
	push:
	# Ensure test job passes before pushing image.
	needs: test

	runs-on: ubuntu-latest
	permissions:
	packages: write
	contents: read
	if: github.event_name == 'push'

	steps:
	- uses: actions/checkout@v4

	- name: Build image
	run: docker build . --file Dockerfile --tag "$IMAGE_NAME"

	- name: Log into GitHub Container Registry
	run: >
	echo "${{ secrets.GITHUB_TOKEN }}" \|
	docker login https://ghcr.io -u ${{ github.actor }} --password-stdin

	- name: Push image to GitHub Container Registry
	run: \|
	IMAGE_ID=ghcr.io/${{ github.repository_owner }}/"$IMAGE_NAME"
	# Change all uppercase to lowercase
	IMAGE_ID=$(echo "$IMAGE_ID" \| tr '[:upper:]' '[:lower:]')
	SHA="${{ github.sha }}"
	# Strip git ref prefix from version
	REF=$(echo "${{ github.ref }}" \| sed -e 's,./$.$,\1,')
	echo IMAGE_ID="$IMAGE_ID"
	echo SHA="$SHA"
	echo REF="$REF"
	docker tag "$IMAGE_NAME" "$IMAGE_ID":"$SHA"
	docker tag "$IMAGE_NAME" "$IMAGE_ID":"$REF"
	docker push "$IMAGE_ID":"$REF"
	docker push "$IMAGE_ID":"$SHA"

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