Update README.md #9

	name: Build pkgsite docker image

	# This workflow runs when any of the following occur:
	# - A push is made to a branch called `main` or `seed`
	# - A tag starting with "v" is created
	# - A pull request is created or updated
	on:
	push:
	branches:
	- main
	tags:
	- v*
	pull_request:
	# This creates an environment variable called `IMAGE_NAME ` with the value `ghtoken_product_demo`.
	env:
	IMAGE_NAME: pkgsite
	#
	jobs:
	# This pushes the image to GitHub Packages.
	push:
	runs-on: ubuntu-latest
	permissions:
	packages: write
	contents: read
	#
	steps:
	- uses: actions/checkout@v4

	- name: Build image
	run: docker build . --file Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"

	- name: Log in to registry
	run: echo "${{ secrets.GITHUB_TOKEN }}" \| docker login ghcr.io -u $ --password-stdin
	#
	- name: Push image
	run: \|
	IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME

	# This changes all uppercase characters to lowercase.
	IMAGE_ID=$(echo $IMAGE_ID \| tr '[A-Z]' '[a-z]')
	# This strips the git ref prefix from the version.
	VERSION=$(echo "${{ github.ref }}" \| sed -e 's,./$.$,\1,')
	# This strips the "v" prefix from the tag name.
	[[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION \| sed -e 's/^v//')
	# This uses the Docker `latest` tag convention.
	[ "$VERSION" == "main" ] && VERSION=latest
	echo IMAGE_ID=$IMAGE_ID
	echo VERSION=$VERSION
	docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
	docker push $IMAGE_ID:$VERSION

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