Update to Jenkins 2.470-jdk21 #51

	name: Docker

	# 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.

	on:
	push:
	tags: [ 'v.' ]
	workflow_dispatch:

	env:
	# Use docker.io for Docker Hub if empty
	REGISTRY: ghcr.io
	# github.repository as <account>/<repo>
	IMAGE_NAME: ${{ github.repository_owner }}/jenkins


	jobs:
	build:

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

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

	# Login against a Docker registry except on PR
	# https://github.com/docker/login-action
	- name: Log into registry ${{ env.REGISTRY }}
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	# Extract metadata (tags, labels) for Docker
	# https://github.com/docker/metadata-action
	- name: Extract Docker metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	tags: \|
	type=match,pattern=v(\d+.\d+),group=1

	# Build and push Docker image with Buildx (don't push on PR)
	# https://github.com/docker/build-push-action
	- name: Build and push Docker image
	uses: docker/build-push-action@v5
	with:
	context: .
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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