Added matrix build for both Alpine and Debian images. #18

	name: Build Docker image

	on:
	push:
	workflow_dispatch:

	env:
	registry: ghcr.io

	jobs:
	Build_image:
	runs-on: ubuntu-latest

	permissions:
	packages: write

	strategy:
	matrix:
	distro:
	- Alpine
	- Debian

	steps:
	- uses: actions/checkout@v3

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

	- name: Declare image name (${{ env.image }})
	run: image=${GITHUB_REPOSITORY,,} && echo image=${image%-*} \| tee -a "$GITHUB_ENV"

	- name: Build Docker image (${{ matrix.distro }})
	run: docker build --tag ${tag=${{ env.registry }}/${{ env.image }}:${distro,,}} - <$distro.Dockerfile
	&& <<<tag=$tag tee -a "$GITHUB_ENV"
	env:
	distro: ${{ matrix.distro }}

	- name: Push Docker image (${{ env.tag }})
	run: docker push ${{ env.tag }}

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