Add checkout #2

# to view logs

	on:
	push:
	branches:
	- main
	env:
	DOCKER_IMAGE_NAME: boxlang-demo

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout Repository
	uses: actions/checkout@v3

	- name: Setup vars
	id: vars
	run: \|
	lcased=$(echo "${{ github.repository }}" \| tr "[:upper:]" "[:lower:]")

	echo "repository_lower=$lcased" >> "$GITHUB_OUTPUT"

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

	- name: Github Container Registry Login
	uses: docker/#-action@v1
	with:
	registry: ghcr.io
	username: publisher
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build image and push to GitHub Container Registry
	uses: docker/build-push-action@v4
	with:
	# Disabling provenance check due to https://community.fly.io/t/images-built-with-the-latest-docker-buildx-and-or-github-actions-work-again/10816
	provenance: false
	builder: ${{ steps.buildx.outputs.name }}
	file: .github/build/Dockerfile
	context: .
	tags: \|
	ghcr.io/${{ steps.vars.outputs.repository_lower }}/${{ env.DOCKER_IMAGE_NAME }}:latest
	push: true

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