follow guide at https://docs.github.com/en/actions/use-cases-and-exam… #13

	name: Build and Push Docker Image

	on:
	push:
	branches:
	- master

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

	jobs:
	build-and-push:
	strategy:
	matrix:
	IMAGE_TAG:
	- msvc
	# - gcc-4.8
	# - latest
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	attestations: write
	id-token: write
	steps:
	- name: Login to GHCR
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Extract metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	- name: Build and push
	id: push
	uses: docker/build-push-action@v6
	with:
	context: "{{defaultContext}}:${{ matrix.IMAGE_TAG }}"
	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: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
	subject-digest: ${{ steps.push.outputs.digest }}
	push-to-registry: true

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