add sponsorship #33

	name: docker image builder
	on:
	push:
	branches:
	- 'master'

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	with:
	submodules: true

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v1

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1

	- name: Cache Docker layers
	uses: actions/cache@v2
	with:
	path: /tmp/.buildx-cache
	key: ${{ runner.os }}-buildx-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-buildx-

	- name: Login to DockerHub
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Lower case for Docker Hub
	id: dh_string
	uses: ASzc/change-string-case-action@v1
	with:
	string: ${{ secrets.DOCKERHUB_USERNAME }}/${{ github.event.repository.name }}

	- name: Lower case for ghcr
	id: ghcr_string
	uses: ASzc/change-string-case-action@v1
	with:
	string: ${{ github.event.repository.full_name }}

	- name: Build and push
	uses: docker/build-push-action@v2
	with:
	context: .
	platforms: linux/amd64,linux/arm64
	push: true
	tags: \|
	${{ steps.dh_string.outputs.lowercase }}
	ghcr.io/${{ steps.ghcr_string.outputs.lowercase }}
	cache-from: type=local,src=/tmp/.buildx-cache
	cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max

	- name: Move cache
	run: \|
	rm -rf /tmp/.buildx-cache
	mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Provide feedback