Build

Add version check step for tag-triggered runs #4

	name: "Build"

	on:
	push:
	branches:
	- "main"
	tags:
	- "[0-9]+.[0-9]+.[0-9]+*"

	jobs:
	build:
	name: "Build"
	runs-on: "ubuntu-latest"
	permissions:
	packages: "write"
	env:
	# GitHub Actions expressions conditionals are ternary expressions that
	# look a lot like bash. In Python, this would read as:
	#
	# github.ref_name if github.ref_type == 'tag' else 'latest'
	#
	# https://docs.github.com/en/actions/learn-github-actions/expressions
	IMAGE_TAG: "${{ github.ref_type == 'tag' && github.ref_name \|\| 'latest' }}"

	steps:
	- uses: "actions/checkout@v3"

	- name: "Check version"
	if: "github.ref_type == 'tag'"
	run: \|
	source .env
	test ${{ github.ref_name }} = ${VERSION}

	- name: "Build"
	run: "docker compose build"

	- name: "GHCR login"
	uses: "docker/login-action@v2"
	with:
	registry: "ghcr.io"
	username: "${{ github.repository_owner }}"
	password: "${{ secrets.GITHUB_TOKEN }}"

	- name: "Push to image registry"
	run: "docker compose push"

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