add: build and publish docker image job #3

	name: Create and publish a Docker image

	on:
	push:
	branches:
	- main

	env:
	REGISTRY: ghcr.io

	jobs:
	build-and-push-image:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	include:
	- dockerfile: ./backend/Dockerfile
	image: ghcr.io/${{ github.repository }}/backend
	- dockerfile: ./frontend/Dockerfile
	image: ghcr.io/${{ github.repository }}/frontend
	permissions:
	contents: read
	packages: write
	attestations: write
	id-token: write
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	- name: Log in to the Container registry
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ matrix.image }}
	- name: Build and push Docker image
	id: push
	uses: docker/build-push-action@v6
	with:
	context: .
	file: ${{ matrix.dockerfile }}
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	- name: Generate artifact attestation
	uses: actions/attest-build-provenance@v1
	with:
	subject-name: ${{ env.REGISTRY }}/${{ matrix.image }}
	subject-digest: ${{ steps.push.outputs.digest }}
	push-to-registry: true

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