workflow add #1

	name: Build and Push Docker Image

	# Builds docker/Dockerfile on every push to main and publishes two tags to GHCR:
	# - :latest always points at the newest commit on main
	# - :alpha-v0.1.<N> a unique, ever-increasing build number (N = GitHub run number)
	# No release process — this project has no contributors/issues yet, so every commit
	# on main is just pushed straight to the registry.
	on:
	push:
	branches: [main]

	env:
	REGISTRY: ghcr.io

	jobs:
	build-and-push:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	# GHCR requires lowercase image names; github.repository preserves repo casing
	# ("jherforth/Monastery"), which would fail the push.
	- name: Compute lowercase image name
	id: image
	run: echo "name=${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Log in to GHCR
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	context: .
	file: docker/Dockerfile
	platforms: linux/amd64
	push: true
	tags: \|
	${{ env.REGISTRY }}/${{ steps.image.outputs.name }}:latest
	${{ env.REGISTRY }}/${{ steps.image.outputs.name }}:alpha-v0.1.${{ github.run_number }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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