ops: improve ci by attesting build #37

	name: Build Docker Image

	on:
	push:
	branches:
	- main
	env:
	IMAGE_NAME: drawbu.dev
	REGISTRY: ghcr.io

	jobs:
	docker:
	runs-on: ubuntu-latest

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

	- name: Setup Nix
	uses: cachix/install-nix-action@v30

	- name: Build Docker image
	run: nix build .#docker

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

	- name: Push Docker image to GitHub Container Registry
	run: \|
	docker load < result
	docker push ${{ env.IMAGE_NAME }} ghcr.io/${{ github.repository }}

	- name: Attest
	uses: actions/attest-build-provenance@v1
	id: attest
	with:
	subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	subject-digest: ${{ steps.push.outputs.digest }}
	push-to-registry: true

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