Read version from file #4

	name: Create and publish docker image to GitHub Container Registry

	on:
	workflow_dispatch:
	push:
	branches: ['main']

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: "" # Deliberately left empty, will be assigned the lower-cased repo slug: automattic/maubot.
	IMAGE_VERSION: "" # Deliberately left empty, will be assigned the value in the ./version file.

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout repository
	uses: actions/checkout@v3

	- name: Lowercase IMAGE_NAME
	run: \|
	echo "IMAGE_NAME=${GITHUB_REPOSITORY,,}" >>${GITHUB_ENV}

	- name: Assign version to environment variable
	run: echo 'IMAGE_VERSION='$(cat version) >> $GITHUB_ENV

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

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v4
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

	- name: Build and publish image
	uses: docker/build-push-action@v4
	with:
	context: .
	push: true
	tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_VERSION }}
	labels: ${{ steps.meta.outputs.labels }}

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