Add Elm Land Docker example #1

	name: Check and Build

	on:
	push:
	branches:
	- main
	pull_request:
	types:
	- opened
	# "synchronize" means new commits pushed to the HEAD of the pull request branch
	- synchronize

	env:
	REGISTRY: ghcr.io
	# What tags does:
	# - always tag with sha
	# - always tag with branch name
	# - if a release tag is 'v1.0.0', then tag 'latest' and '1.0.0'
	# More info: https://github.com/docker/metadata-action#tags-input
	TAGS: \|
	type=sha
	type=ref,event=branch
	type=match,pattern=v(\d+),group=1

	jobs:
	build:
	name: Build and Push Docker Images
	runs-on: ubuntu-22.04

	steps:
	- uses: actions/checkout@v3

	- name: Log in to the Container registry
	uses: docker/login-action@v2
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

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

	- name: Prepare tags and labels
	id: meta-webapp
	uses: docker/metadata-action@v4
	with:
	images: ${{ env.REGISTRY }}/vladimirlogachev/elm-land-docker-example
	tags: ${{ env.TAGS }}

	- name: Build and push Docker image
	uses: docker/build-push-action@v4
	with:
	context: .
	file: ./Dockerfile
	push: true
	tags: ${{ steps.meta-webapp.outputs.tags }}
	labels: ${{ steps.meta-webapp.outputs.labels }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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