Update README.md #90

	name: Docker

	on:
	push:
	branches: [develop, main]
	tags:
	- v*
	paths-ignore:
	- '**/README.md'
	pull_request:

	env:
	IMAGE_NAME: polyglot-code-server
	SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

	jobs:
	test:
	if: github.ref_name == 'develop'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Log into GitHub Container Registry
	run: echo "${{ secrets.CR_PAT }}" \| docker login https://ghcr.io -u ${{ github.actor }} --password-stdin

	- name: Run tests
	if: always()
	run: \|
	docker build . --file Dockerfile

	publish:
	if: github.ref_name == 'main'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Log into GitHub Container Registry
	run: echo "${{ secrets.CR_PAT }}" \| docker login https://ghcr.io -u ${{ github.actor }} --password-stdin

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

	- 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 '[A-Z]' '[a-z]')

	# Strip git ref prefix from version
	VERSION=$(echo "${{ github.ref }}" \| sed -e 's,./$.$,\1,')

	# Strip "v" prefix from tag name
	[[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION \| sed -e 's/^v//')

	# Use 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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