fix missing ARG in Dockerfile #7

	name: base-image

	on:
	pull_request:
	branches:
	- main
	- test
	push:
	branches:
	- main
	- test
	tags:
	- 'v*'

	jobs:
	build-base:

	strategy:
	matrix:
	name: [alpine-base]

	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

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

	# https://docs.docker.com/build/ci/github-actions/multi-platform/
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v2

	# Workaround: https://github.com/docker/build-push-action/issues/461
	- name: Setup Docker buildx
	uses: docker/setup-buildx-action@v2

	# https://github.com/docker/login-action
	- name: Login to DockerHub
	uses: docker/login-action@v2
	with:
	username: ${{ secrets.DOCKERHUB_USER }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

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

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v4
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	images: \|
	ghcr.io/${{ github.repository }}/${{ matrix.name }}
	${{ secrets.DOCKERHUB_USER }}/${{ matrix.name }}
	tags: \|
	type=sha
	type=edge,branch=test
	type=semver,pattern={{tag}}
	type=semver,pattern={{version}}
	type=raw,value=latest,enable={{is_default_branch}}

	- name: Build docker image
	uses: docker/build-push-action@v4
	with:
	push: ${{ github.event_name != 'pull_request' }}
	file: ${{ matrix.name }}.Dockerfile
	platforms: linux/amd64,linux/arm64
	tags: ${{ env.DOCKER_METADATA_OUTPUT_TAGS }}
	labels: ${{ env.DOCKER_METADATA_OUTPUT_LABELS }}

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