chore(deps): update docker.io/library/alpine docker tag to v3.21.0 #565

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.

	# GitHub recommends pinning actions to a commit SHA.
	# To get a newer version, you will need to update the SHA.
	# You can also reference a tag or branch, but the action may change without warning.

	name: Create and publish a container image

	on:
	push:
	branches: [ master ]
	tags: [ '*' ]
	pull_request:
	branches: [ master ]

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout repository
	uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v2

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v2

	- name: Log in to the Container registry
	uses: docker/login-action@7ca345011ac4304463197fac0e56eab1bc7e6af0
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@b53be03109c4ef6f6cc7aa545b84b17a7fe51c1e
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

	- name: Build and push Docker image
	uses: docker/build-push-action@5e99dacf67635c4f273e532b9266ddb609b3025a
	with:
	context: .
	push: true
	platforms: linux/amd64,linux/arm64
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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