README: add update hints #225

	name: Docker build

	on:
	push:
	branches:
	- 'main'
	tags:
	- '*'
	pull_request:

	jobs:
	docker-build:
	runs-on: ubuntu-latest
	steps:
	-
	name: Checkout
	uses: actions/[email protected]
	-
	name: Docker meta
	id: docker_meta
	uses: crazy-max/[email protected]
	with:
	images: ghcr.io/${{ github.repository }}
	-
	name: Set up QEMU
	uses: docker/[email protected]
	-
	name: Set up Docker Buildx
	uses: docker/[email protected]
	-
	name: Cache Docker layers
	uses: actions/[email protected]
	with:
	path: /tmp/.buildx-cache
	key: ${{ runner.os }}-buildx-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-buildx-
	-
	name: Login to GitHub Container Registry
	uses: docker/[email protected]
	if: github.event_name != 'pull_request'
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}
	-
	name: Build and push
	uses: docker/[email protected]
	with:
	context: .
	file: ./Dockerfile
	platforms: linux/amd64
	cache-from: type=local,src=/tmp/.buildx-cache
	cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.docker_meta.outputs.tags }}
	labels: ${{ steps.docker_meta.outputs.labels }}

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