Bump alpine from 3.20.3 to 3.21.0 #137

	name: build docker image

	on:
	workflow_dispatch:
	push:
	branches:
	- "**"
	tags:
	- "**"

	jobs:
	test:
	runs-on: ubuntu-22.04
	steps:
	- name: Checkout the code
	uses: actions/checkout@v4
	- name: Test Bash scripts
	run: sudo apt-get -qq update && sudo apt-get install -y devscripts shellcheck && make test
	- name: Test image
	env:
	VOLUME_PATH: /tmp/mariadb
	DATABASE_NAME: foo
	MARIADB_ROOT_PASSWORD: abcd
	run: \|
	docker compose up -d mariadb
	docker compose run backup /backup.sh
	docker compose run backup /restore.sh /backup/latest.foo.sql.gz
	docker compose stop
	build:
	runs-on: ubuntu-22.04
	needs: test
	steps:
	- name: Checkout the code
	uses: actions/checkout@v4
	# https://github.com/docker/setup-qemu-action
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3
	# https://github.com/docker/setup-buildx-action
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Get latest release version number
	id: docker-tag
	uses: yuya-takeyama/docker-tag-from-github-ref-action@v1
	- name: Login to Docker Hub
	uses: docker/login-action@v3
	with:
	username: fradelg
	password: ${{ secrets.DOCKER_PASSWORD }}
	- name: Build multiarch image
	run: \|
	docker buildx build --push \
	--tag fradelg/mysql-cron-backup:${{ steps.docker-tag.outputs.tag }} \
	--platform linux/amd64,linux/arm/v7,linux/arm64 .

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