cp workflow to .github/workflows #2

	name: Push to artifact registry
	description: Composite action to push to Google Artifact Registry
	inputs:
	registry:
	description: \|
	Google Artifact Registry to store docker images in.
	project:
	description: \|
	The project which organises the Google Cloud resources.
	repository:
	description: \|
	Repository to store the docker image.
	image_name:
	description: \|
	The name of the Docker image to be created.
	tag:
	description: \|
	Docker image tag.
	build_path:
	description: \|
	Path to Dockerfile, which is used to build the image.

	on:
	pull_request:

	runs:
	using: composite
	steps:
	- uses: actions/checkout@v3
	- uses: google-github-actions/auth@v1
	id: gcloud-auth
	with:
	token_format: access_token
	workload_identity_provider: "projects/304398677251/locations/global/workloadIdentityPools/github/providers/github-provider"
	service_account: "github-gcr-dev@grafanalabs-workload-identity.iam.gserviceaccount.com"
	create_credentials_file: false
	- name: Login to GAR
	uses: docker/login-action@v3
	with:
	registry: ${{ inputs.registry }}
	username: oauth2accesstoken
	password: ${{ steps.gcloud-auth.outputs.access_token }}
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3.0.0
	- name: Build the container
	uses: docker/build-push-action@v5.0.0
	with:
	context: ${{ inputs.build_path }}
	push: ${{ github.event_name == 'push' }}
	tags: \|
	${{ inputs.registry }}/${{ inputs.project }}/${{ inputs.repository }}/${{ inputs.image_name }}:${{ inputs.tag }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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