Added cache for GHA Docker builds #1502

	name: Docker test build

	on:
	pull_request:

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

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	permissions:
	contents: read

	jobs:
	build-image:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	req_file:
	- prod.txt
	- tests.txt

	# steps taken (and trimmed) from docker-publish.yml
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

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

	- name: Log in to the Container registry
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Test docker image build (local development)
	uses: docker/build-push-action@v6
	with:
	context: .
	push: false
	build-args: \|
	REQ_FILE=requirements/${{ matrix.req_file }}
	cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache-test-build-${{ matrix.req_file }}
	cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache-test-build-${{ matrix.req_file }},mode=max

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