Bump docker/setup-buildx-action from 2 to 3 #5

	name: CI

	"on":
	push:
	branches-ignore:
	# These should always correspond to pull requests, so ignore them for
	# the push trigger and let them be triggered by the pull_request
	# trigger, avoiding running the workflow twice. This is a minor
	# optimization so there's no need to ensure this is comprehensive.
	- "dependabot/**"
	- "renovate/**"
	- "tickets/**"
	- "u/**"
	tags:
	- "*"
	pull_request: {}

	jobs:

	build:

	runs-on: ubuntu-latest
	# Only do Docker builds of tagged releases and pull requests from ticket
	# branches. This will still trigger on pull requests from untrusted
	# repositories whose branch names match our tickets/* branch convention,
	# but in this case the build will fail with an error since the secret
	# won't be set.
	if: >
	startsWith(github.ref, 'refs/tags/')
	\|\| startsWith(github.head_ref, 'tickets/')

	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Define the Docker tag
	id: vars
	run: echo ::set-output name=tag::$(scripts/docker-tag.sh)

	- name: Print the tag
	id: print
	run: echo ${{ steps.vars.outputs.tag }}

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Log in to GitHub Container Registry
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build and push
	uses: docker/build-push-action@v4
	with:
	context: .
	push: true
	tags: \|
	ghcr.io/lsst-sqre/worblehat:${{ steps.vars.outputs.tag }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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